Code:
/ Dotnetfx_Win7_3.5.1 / Dotnetfx_Win7_3.5.1 / 3.5.1 / DEVDIV / depot / DevDiv / releases / Orcas / NetFXw7 / wpf / src / Framework / System / Windows / Controls / DefinitionBase.cs / 1 / DefinitionBase.cs
//----------------------------------------------------------------------------
//
//
// Copyright (C) Microsoft Corporation. All rights reserved.
//
//
// Specs
// Grid : http://avalon/layout/Specs/Grid.mht
// Size Sharing: http://avalon/layout/Specs/Size%20Information%20Sharing.doc
//
// Misc
// Grid Tutorial: http://avalon/layout/Documentation%20and%20Tutorials/Grid%20Tutorial.mht
//
// Description: Implementation of base abstract class for ColumnDefinition
// and RowDefinition.
//
// History:
// 11/17/2003 : olego - Created
//
//---------------------------------------------------------------------------
using MS.Internal;
using MS.Internal.KnownBoxes;
using System;
using System.Collections;
using System.Collections.Generic;
using System.ComponentModel;
using System.Diagnostics;
using System.Security.Permissions;
using System.Windows;
using System.Windows.Threading;
namespace System.Windows.Controls
{
///
/// DefinitionBase provides core functionality used internally by Grid
/// and ColumnDefinitionCollection / RowDefinitionCollection
///
[Localizability(LocalizationCategory.Ignore)]
public abstract class DefinitionBase : FrameworkContentElement
{
//-----------------------------------------------------
//
// Constructors
//
//-----------------------------------------------------
#region Constructors
internal DefinitionBase(bool isColumnDefinition)
{
_isColumnDefinition = isColumnDefinition;
_parentIndex = -1;
}
#endregion Constructors
//------------------------------------------------------
//
// Public Properties
//
//-----------------------------------------------------
#region Public Properties
///
/// SharedSizeGroup property.
///
public string SharedSizeGroup
{
get { return (string) GetValue(SharedSizeGroupProperty); }
set { SetValue(SharedSizeGroupProperty, value); }
}
#endregion Public Properties
//------------------------------------------------------
//
// Internal Methods
//
//------------------------------------------------------
#region Internal Methods
///
/// Callback to notify about entering model tree.
///
internal void OnEnterParentTree()
{
if (_sharedState == null)
{
// start with getting SharedSizeGroup value.
// this property is NOT inhereted which should result in better overall perf.
string sharedSizeGroupId = SharedSizeGroup;
if (sharedSizeGroupId != null)
{
SharedSizeScope privateSharedSizeScope = PrivateSharedSizeScope;
if (privateSharedSizeScope != null)
{
_sharedState = privateSharedSizeScope.EnsureSharedState(sharedSizeGroupId);
_sharedState.AddMember(this);
}
}
}
}
///
/// Callback to notify about exitting model tree.
///
internal void OnExitParentTree()
{
_offset = 0;
if (_sharedState != null)
{
_sharedState.RemoveMember(this);
_sharedState = null;
}
}
///
/// Performs action preparing definition to enter layout calculation mode.
///
internal void OnBeforeLayout(Grid grid)
{
// reset layout state.
_minSize = 0;
LayoutWasUpdated = true;
// defer verification for shared definitions
if (_sharedState != null) { _sharedState.EnsureDeferredValidation(grid); }
}
///
/// Updates min size.
///
/// New size.
internal void UpdateMinSize(double minSize)
{
_minSize = Math.Max(_minSize, minSize);
}
///
///
///
/// This method needs to be internal to be accessable from derived classes.
///
internal static void OnUserSizePropertyChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)
{
DefinitionBase definition = (DefinitionBase) d;
if (definition.InParentLogicalTree)
{
if (definition._sharedState != null)
{
definition._sharedState.Invalidate();
}
else
{
Grid parentGrid = (Grid) definition.Parent;
if (((GridLength) e.OldValue).GridUnitType != ((GridLength) e.NewValue).GridUnitType)
{
parentGrid.Invalidate();
}
else
{
parentGrid.InvalidateMeasure();
}
}
}
}
///
///
///
/// This method needs to be internal to be accessable from derived classes.
///
internal static bool IsUserSizePropertyValueValid(object value)
{
return (((GridLength)value).Value >= 0);
}
///
///
///
/// This method needs to be internal to be accessable from derived classes.
///
internal static void OnUserMinSizePropertyChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)
{
DefinitionBase definition = (DefinitionBase) d;
if (definition.InParentLogicalTree)
{
Grid parentGrid = (Grid) definition.Parent;
parentGrid.InvalidateMeasure();
}
}
///
///
///
/// This method needs to be internal to be accessable from derived classes.
///
internal static bool IsUserMinSizePropertyValueValid(object value)
{
double v = (double)value;
return (!DoubleUtil.IsNaN(v) && v >= 0.0d && !Double.IsPositiveInfinity(v));
}
///
///
///
/// This method needs to be internal to be accessable from derived classes.
///
internal static void OnUserMaxSizePropertyChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)
{
DefinitionBase definition = (DefinitionBase) d;
if (definition.InParentLogicalTree)
{
Grid parentGrid = (Grid) definition.Parent;
parentGrid.InvalidateMeasure();
}
}
///
///
///
/// This method needs to be internal to be accessable from derived classes.
///
internal static bool IsUserMaxSizePropertyValueValid(object value)
{
double v = (double)value;
return (!DoubleUtil.IsNaN(v) && v >= 0.0d);
}
///
///
///
/// This method reflects Grid.SharedScopeProperty state by setting / clearing
/// dynamic property PrivateSharedSizeScopeProperty. Value of PrivateSharedSizeScopeProperty
/// is a collection of SharedSizeState objects for the scope.
/// Also PrivateSharedSizeScopeProperty is FrameworkPropertyMetadataOptions.Inherits property. So that all children
/// elements belonging to a certain scope can easily access SharedSizeState collection. As well
/// as been norified about enter / exit a scope.
///
internal static void OnIsSharedSizeScopePropertyChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)
{
//
if ((bool) e.NewValue)
{
SharedSizeScope sharedStatesCollection = new SharedSizeScope();
d.SetValue(PrivateSharedSizeScopeProperty, sharedStatesCollection);
}
else
{
d.ClearValue(PrivateSharedSizeScopeProperty);
}
}
#endregion Internal Methods
//-----------------------------------------------------
//
// Internal Properties
//
//------------------------------------------------------
#region Internal Properties
///
/// Returns true if this definition is a part of shared group.
///
internal bool IsShared
{
get { return (_sharedState != null); }
}
///
/// Internal accessor to user size field.
///
internal GridLength UserSize
{
get { return (_sharedState != null ? _sharedState.UserSize : UserSizeValueCache); }
}
///
/// Internal accessor to user min size field.
///
internal double UserMinSize
{
get { return (UserMinSizeValueCache); }
}
///
/// Internal accessor to user max size field.
///
internal double UserMaxSize
{
get { return (UserMaxSizeValueCache); }
}
///
/// DefinitionBase's index in the parents collection.
///
internal int Index
{
get
{
return (_parentIndex);
}
set
{
Debug.Assert(value >= -1 && _parentIndex != value);
_parentIndex = value;
}
}
///
/// Layout-time user size type.
///
internal Grid.LayoutTimeSizeType SizeType
{
get { return (_sizeType); }
set { _sizeType = value; }
}
///
/// Returns or sets measure size for the definition.
///
internal double MeasureSize
{
get { return (_measureSize); }
set { _measureSize = value; }
}
///
/// Returns definition's layout time type sensitive preferred size.
///
///
/// Returned value is guaranteed to be true preferred size.
///
internal double PreferredSize
{
get
{
double preferredSize = MinSize;
if ( _sizeType != Grid.LayoutTimeSizeType.Auto
&& preferredSize < _measureSize )
{
preferredSize = _measureSize;
}
return (preferredSize);
}
}
///
/// Returns or sets size cache for the definition.
///
internal double SizeCache
{
get { return (_sizeCache); }
set { _sizeCache = value; }
}
///
/// Returns min size.
///
internal double MinSize
{
get
{
double minSize = _minSize;
if ( UseSharedMinimum
&& _sharedState != null
&& minSize < _sharedState.MinSize )
{
minSize = _sharedState.MinSize;
}
return (minSize);
}
}
///
/// Returns min size, always taking into account shared state.
///
internal double MinSizeForArrange
{
get
{
double minSize = _minSize;
if ( _sharedState != null
&& (UseSharedMinimum || !LayoutWasUpdated)
&& minSize < _sharedState.MinSize )
{
minSize = _sharedState.MinSize;
}
return (minSize);
}
}
///
/// Offset.
///
internal double FinalOffset
{
get { return _offset; }
set { _offset = value; }
}
///
/// Internal helper to access up-to-date UserSize property value.
///
internal GridLength UserSizeValueCache
{
get
{
return (GridLength) GetValue(
_isColumnDefinition ?
ColumnDefinition.WidthProperty :
RowDefinition.HeightProperty);
}
}
///
/// Internal helper to access up-to-date UserMinSize property value.
///
internal double UserMinSizeValueCache
{
get
{
return (double) GetValue(
_isColumnDefinition ?
ColumnDefinition.MinWidthProperty :
RowDefinition.MinHeightProperty);
}
}
///
/// Internal helper to access up-to-date UserMaxSize property value.
///
internal double UserMaxSizeValueCache
{
get
{
return (double) GetValue(
_isColumnDefinition ?
ColumnDefinition.MaxWidthProperty :
RowDefinition.MaxHeightProperty);
}
}
///
/// Protected. Returns true if this DefinitionBase instance is in parent's logical tree.
///
internal bool InParentLogicalTree
{
get { return (_parentIndex != -1); }
}
#endregion Internal Properties
//-----------------------------------------------------
//
// Private Methods
//
//-----------------------------------------------------
#region Private Methods
///
/// SetFlags is used to set or unset one or multiple
/// flags on the object.
///
private void SetFlags(bool value, Flags flags)
{
_flags = value ? (_flags | flags) : (_flags & (~flags));
}
///
/// CheckFlagsAnd returns true if all the flags in the
/// given bitmask are set on the object.
///
private bool CheckFlagsAnd(Flags flags)
{
return ((_flags & flags) == flags);
}
///
///
private static void OnSharedSizeGroupPropertyChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)
{
DefinitionBase definition = (DefinitionBase) d;
if (definition.InParentLogicalTree)
{
string sharedSizeGroupId = (string) e.NewValue;
if (definition._sharedState != null)
{
// if definition is already registered AND shared size group id is changing,
// then un-register the definition from the current shared size state object.
definition._sharedState.RemoveMember(definition);
definition._sharedState = null;
}
if ((definition._sharedState == null) && (sharedSizeGroupId != null))
{
SharedSizeScope privateSharedSizeScope = definition.PrivateSharedSizeScope;
if (privateSharedSizeScope != null)
{
// if definition is not registered and both: shared size group id AND private shared scope
// are available, then register definition.
definition._sharedState = privateSharedSizeScope.EnsureSharedState(sharedSizeGroupId);
definition._sharedState.AddMember(definition);
}
}
}
}
///
///
///
/// Verifies that Shared Size Group Property string
/// a) not empty.
/// b) contains only letters, digits and underscore ('_').
/// c) does not start with a digit.
///
private static bool SharedSizeGroupPropertyValueValid(object value)
{
// null is default value
if (value == null)
{
return (true);
}
string id = (string)value;
if (id != string.Empty)
{
int i = -1;
while (++i < id.Length)
{
bool isDigit = Char.IsDigit(id[i]);
if ( (i == 0 && isDigit)
|| !( isDigit
|| Char.IsLetter(id[i])
|| '_' == id[i] ) )
{
break;
}
}
if (i == id.Length)
{
return (true);
}
}
return (false);
}
///
///
///
/// OnPrivateSharedSizeScopePropertyChanged is called when new scope enters or
/// existing scope just left. In both cases if the DefinitionBase object is already registered
/// in SharedSizeState, it should un-register and register itself in a new one.
///
private static void OnPrivateSharedSizeScopePropertyChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)
{
DefinitionBase definition = (DefinitionBase)d;
if (definition.InParentLogicalTree)
{
SharedSizeScope privateSharedSizeScope = (SharedSizeScope) e.NewValue;
if (definition._sharedState != null)
{
// if definition is already registered And shared size scope is changing,
// then un-register the definition from the current shared size state object.
definition._sharedState.RemoveMember(definition);
definition._sharedState = null;
}
if ((definition._sharedState == null) && (privateSharedSizeScope != null))
{
string sharedSizeGroup = definition.SharedSizeGroup;
if (sharedSizeGroup != null)
{
// if definition is not registered and both: shared size group id AND private shared scope
// are available, then register definition.
definition._sharedState = privateSharedSizeScope.EnsureSharedState(definition.SharedSizeGroup);
definition._sharedState.AddMember(definition);
}
}
}
}
#endregion Private Methods
//-----------------------------------------------------
//
// Private Properties
//
//------------------------------------------------------
#region Private Properties
///
/// Private getter of shared state collection dynamic property.
///
private SharedSizeScope PrivateSharedSizeScope
{
get { return (SharedSizeScope) GetValue(PrivateSharedSizeScopeProperty); }
}
///
/// Convenience accessor to UseSharedMinimum flag
///
private bool UseSharedMinimum
{
get { return (CheckFlagsAnd(Flags.UseSharedMinimum)); }
set { SetFlags(value, Flags.UseSharedMinimum); }
}
///
/// Convenience accessor to LayoutWasUpdated flag
///
private bool LayoutWasUpdated
{
get { return (CheckFlagsAnd(Flags.LayoutWasUpdated)); }
set { SetFlags(value, Flags.LayoutWasUpdated); }
}
#endregion Private Properties
//-----------------------------------------------------
//
// Private Fields
//
//------------------------------------------------------
#region Private Fields
private readonly bool _isColumnDefinition; // when "true", this is a ColumnDefinition; when "false" this is a RowDefinition (faster than a type check)
private Flags _flags; // flags reflecting various aspects of internal state
private int _parentIndex; // this instance's index in parent's children collection
private Grid.LayoutTimeSizeType _sizeType; // layout-time user size type. it may differ from _userSizeValueCache.UnitType when calculating "to-content"
private double _minSize; // used during measure to accumulate size for "Auto" and "Star" DefinitionBase's
private double _measureSize; // size, calculated to be the input contstraint size for Child.Measure
private double _sizeCache; // cache used for various purposes (sorting, caching, etc) during calculations
private double _offset; // offset of the DefinitionBase from left / top corner (assuming LTR case)
private SharedSizeState _sharedState; // reference to shared state object this instance is registered with
internal const bool ThisIsColumnDefinition = true;
internal const bool ThisIsRowDefinition = false;
#endregion Private Fields
//------------------------------------------------------
//
// Private Structures / Classes
//
//-----------------------------------------------------
#region Private Structures Classes
[System.Flags]
private enum Flags : byte
{
//
// bool flags
//
UseSharedMinimum = 0x00000020, // when "1", definition will take into account shared state's minimum
LayoutWasUpdated = 0x00000040, // set to "1" every time the parent grid is measured
}
///
/// Collection of shared states objects for a single scope
///
private class SharedSizeScope
{
///
/// Returns SharedSizeState object for a given group.
/// Creates a new StatedState object if necessary.
///
internal SharedSizeState EnsureSharedState(string sharedSizeGroup)
{
// check that sharedSizeGroup is not default
Debug.Assert(sharedSizeGroup != null);
SharedSizeState sharedState = _registry[sharedSizeGroup] as SharedSizeState;
if (sharedState == null)
{
sharedState = new SharedSizeState(this, sharedSizeGroup);
_registry[sharedSizeGroup] = sharedState;
}
return (sharedState);
}
///
/// Removes an entry in the registry by the given key.
///
internal void Remove(object key)
{
Debug.Assert(_registry.Contains(key));
_registry.Remove(key);
}
private Hashtable _registry = new Hashtable(); // storage for shared state objects
}
///
/// Implementation of per shared group state object
///
private class SharedSizeState
{
///
/// Default ctor.
///
internal SharedSizeState(SharedSizeScope sharedSizeScope, string sharedSizeGroupId)
{
Debug.Assert(sharedSizeScope != null && sharedSizeGroupId != null);
_sharedSizeScope = sharedSizeScope;
_sharedSizeGroupId = sharedSizeGroupId;
_registry = new List();
_layoutUpdated = new EventHandler(OnLayoutUpdated);
_broadcastInvalidation = true;
}
///
/// Adds / registers a definition instance.
///
internal void AddMember(DefinitionBase member)
{
Debug.Assert(!_registry.Contains(member));
_registry.Add(member);
Invalidate();
}
///
/// Removes / un-registers a definition instance.
///
///
/// If the collection of registered definitions becomes empty
/// instantiates self removal from owner's collection.
///
internal void RemoveMember(DefinitionBase member)
{
Invalidate();
_registry.Remove(member);
if (_registry.Count == 0)
{
_sharedSizeScope.Remove(_sharedSizeGroupId);
}
}
///
/// Propogates invalidations for all registered definitions.
/// Resets its own state.
///
internal void Invalidate()
{
_userSizeValid = false;
if (_broadcastInvalidation)
{
for (int i = 0, count = _registry.Count; i < count; ++i)
{
Grid parentGrid = (Grid)(_registry[i].Parent);
parentGrid.Invalidate();
}
_broadcastInvalidation = false;
}
}
///
/// Makes sure that one and only one layout updated handler is registered for this shared state.
///
internal void EnsureDeferredValidation(UIElement layoutUpdatedHost)
{
if (_layoutUpdatedHost == null)
{
_layoutUpdatedHost = layoutUpdatedHost;
_layoutUpdatedHost.LayoutUpdated += _layoutUpdated;
}
}
///
/// DefinitionBase's specific code.
///
internal double MinSize
{
get
{
if (!_userSizeValid) { EnsureUserSizeValid(); }
return (_minSize);
}
}
///
/// DefinitionBase's specific code.
///
internal GridLength UserSize
{
get
{
if (!_userSizeValid) { EnsureUserSizeValid(); }
return (_userSize);
}
}
private void EnsureUserSizeValid()
{
_userSize = new GridLength(1, GridUnitType.Auto);
for (int i = 0, count = _registry.Count; i < count; ++i)
{
Debug.Assert( _userSize.GridUnitType == GridUnitType.Auto
|| _userSize.GridUnitType == GridUnitType.Pixel );
GridLength currentGridLength = _registry[i].UserSizeValueCache;
if (currentGridLength.GridUnitType == GridUnitType.Pixel)
{
if (_userSize.GridUnitType == GridUnitType.Auto)
{
_userSize = currentGridLength;
}
else if (_userSize.Value < currentGridLength.Value)
{
_userSize = currentGridLength;
}
}
}
// taking maximum with user size effectively prevents squishy-ness.
// this is a "solution" to avoid shared definitions from been sized to
// different final size at arrange time, if / when different grids receive
// different final sizes.
_minSize = _userSize.IsAbsolute ? _userSize.Value : 0.0;
_userSizeValid = true;
}
///
/// OnLayoutUpdated handler. Validates that all participating definitions
/// have updated min size value. Forces another layout update cycle if needed.
///
private void OnLayoutUpdated(object sender, EventArgs e)
{
double sharedMinSize = 0;
// accumulate min size of all participating definitions
for (int i = 0, count = _registry.Count; i < count; ++i)
{
sharedMinSize = Math.Max(sharedMinSize, _registry[i].MinSize);
}
bool sharedMinSizeChanged = !DoubleUtil.AreClose(_minSize, sharedMinSize);
// compare accumulated min size with min sizes of the individual definitions
for (int i = 0, count = _registry.Count; i < count; ++i)
{
DefinitionBase definitionBase = _registry[i];
if (sharedMinSizeChanged || definitionBase.LayoutWasUpdated)
{
// if definition's min size is different, then need to re-measure
if (!DoubleUtil.AreClose(sharedMinSize, definitionBase.MinSize))
{
Grid parentGrid = (Grid)definitionBase.Parent;
parentGrid.InvalidateMeasure();
definitionBase.UseSharedMinimum = true;
}
else
{
definitionBase.UseSharedMinimum = false;
// if measure is valid then also need to check arrange.
// Note: definitionBase.SizeCache is volatile but at this point
// it contains up-to-date final size
if (!DoubleUtil.AreClose(sharedMinSize, definitionBase.SizeCache))
{
Grid parentGrid = (Grid)definitionBase.Parent;
parentGrid.InvalidateArrange();
}
}
definitionBase.LayoutWasUpdated = false;
}
}
_minSize = sharedMinSize;
_layoutUpdatedHost.LayoutUpdated -= _layoutUpdated;
_layoutUpdatedHost = null;
_broadcastInvalidation = true;
}
private readonly SharedSizeScope _sharedSizeScope; // the scope this state belongs to
private readonly string _sharedSizeGroupId; // Id of the shared size group this object is servicing
private readonly List _registry; // registry of participating definitions
private readonly EventHandler _layoutUpdated; // instance event handler for layout updated event
private UIElement _layoutUpdatedHost; // UIElement for which layout updated event handler is registered
private bool _broadcastInvalidation; // "true" when broadcasting of invalidation is needed
private bool _userSizeValid; // "true" when _userSize is up to date
private GridLength _userSize; // shared state
private double _minSize; // shared state
}
#endregion Private Structures Classes
//------------------------------------------------------
//
// Properties
//
//-----------------------------------------------------
#region Properties
///
/// Private shared size scope property holds a collection of shared state objects for the a given shared size scope.
///
internal static readonly DependencyProperty PrivateSharedSizeScopeProperty =
DependencyProperty.RegisterAttached(
"PrivateSharedSizeScope",
typeof(SharedSizeScope),
typeof(DefinitionBase),
new FrameworkPropertyMetadata(
null,
FrameworkPropertyMetadataOptions.Inherits));
///
/// Shared size group property marks column / row definition as belonging to a group "Foo" or "Bar".
///
///
/// Value of the Shared Size Group Property must satisfy the following rules:
///
///
/// String must not be empty.
///
/// String must consist of letters, digits and underscore ('_') only.
///
/// String must not start with a digit.
///
///
public static readonly DependencyProperty SharedSizeGroupProperty =
DependencyProperty.Register(
"SharedSizeGroup",
typeof(string),
typeof(DefinitionBase),
new FrameworkPropertyMetadata(new PropertyChangedCallback(OnSharedSizeGroupPropertyChanged)),
new ValidateValueCallback(SharedSizeGroupPropertyValueValid));
///
/// Static ctor. Used for static registration of properties.
///
static DefinitionBase()
{
PrivateSharedSizeScopeProperty.OverrideMetadata(
typeof(DefinitionBase),
new FrameworkPropertyMetadata(new PropertyChangedCallback(OnPrivateSharedSizeScopePropertyChanged)));
}
#endregion Properties
}
}
// File provided for Reference Use Only by Microsoft Corporation (c) 2007.
// Copyright (c) Microsoft Corporation. All rights reserved.
//----------------------------------------------------------------------------
//
//
// Copyright (C) Microsoft Corporation. All rights reserved.
//
//
// Specs
// Grid : http://avalon/layout/Specs/Grid.mht
// Size Sharing: http://avalon/layout/Specs/Size%20Information%20Sharing.doc
//
// Misc
// Grid Tutorial: http://avalon/layout/Documentation%20and%20Tutorials/Grid%20Tutorial.mht
//
// Description: Implementation of base abstract class for ColumnDefinition
// and RowDefinition.
//
// History:
// 11/17/2003 : olego - Created
//
//---------------------------------------------------------------------------
using MS.Internal;
using MS.Internal.KnownBoxes;
using System;
using System.Collections;
using System.Collections.Generic;
using System.ComponentModel;
using System.Diagnostics;
using System.Security.Permissions;
using System.Windows;
using System.Windows.Threading;
namespace System.Windows.Controls
{
///
/// DefinitionBase provides core functionality used internally by Grid
/// and ColumnDefinitionCollection / RowDefinitionCollection
///
[Localizability(LocalizationCategory.Ignore)]
public abstract class DefinitionBase : FrameworkContentElement
{
//-----------------------------------------------------
//
// Constructors
//
//-----------------------------------------------------
#region Constructors
internal DefinitionBase(bool isColumnDefinition)
{
_isColumnDefinition = isColumnDefinition;
_parentIndex = -1;
}
#endregion Constructors
//------------------------------------------------------
//
// Public Properties
//
//-----------------------------------------------------
#region Public Properties
///
/// SharedSizeGroup property.
///
public string SharedSizeGroup
{
get { return (string) GetValue(SharedSizeGroupProperty); }
set { SetValue(SharedSizeGroupProperty, value); }
}
#endregion Public Properties
//------------------------------------------------------
//
// Internal Methods
//
//------------------------------------------------------
#region Internal Methods
///
/// Callback to notify about entering model tree.
///
internal void OnEnterParentTree()
{
if (_sharedState == null)
{
// start with getting SharedSizeGroup value.
// this property is NOT inhereted which should result in better overall perf.
string sharedSizeGroupId = SharedSizeGroup;
if (sharedSizeGroupId != null)
{
SharedSizeScope privateSharedSizeScope = PrivateSharedSizeScope;
if (privateSharedSizeScope != null)
{
_sharedState = privateSharedSizeScope.EnsureSharedState(sharedSizeGroupId);
_sharedState.AddMember(this);
}
}
}
}
///
/// Callback to notify about exitting model tree.
///
internal void OnExitParentTree()
{
_offset = 0;
if (_sharedState != null)
{
_sharedState.RemoveMember(this);
_sharedState = null;
}
}
///
/// Performs action preparing definition to enter layout calculation mode.
///
internal void OnBeforeLayout(Grid grid)
{
// reset layout state.
_minSize = 0;
LayoutWasUpdated = true;
// defer verification for shared definitions
if (_sharedState != null) { _sharedState.EnsureDeferredValidation(grid); }
}
///
/// Updates min size.
///
/// New size.
internal void UpdateMinSize(double minSize)
{
_minSize = Math.Max(_minSize, minSize);
}
///
///
///
/// This method needs to be internal to be accessable from derived classes.
///
internal static void OnUserSizePropertyChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)
{
DefinitionBase definition = (DefinitionBase) d;
if (definition.InParentLogicalTree)
{
if (definition._sharedState != null)
{
definition._sharedState.Invalidate();
}
else
{
Grid parentGrid = (Grid) definition.Parent;
if (((GridLength) e.OldValue).GridUnitType != ((GridLength) e.NewValue).GridUnitType)
{
parentGrid.Invalidate();
}
else
{
parentGrid.InvalidateMeasure();
}
}
}
}
///
///
///
/// This method needs to be internal to be accessable from derived classes.
///
internal static bool IsUserSizePropertyValueValid(object value)
{
return (((GridLength)value).Value >= 0);
}
///
///
///
/// This method needs to be internal to be accessable from derived classes.
///
internal static void OnUserMinSizePropertyChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)
{
DefinitionBase definition = (DefinitionBase) d;
if (definition.InParentLogicalTree)
{
Grid parentGrid = (Grid) definition.Parent;
parentGrid.InvalidateMeasure();
}
}
///
///
///
/// This method needs to be internal to be accessable from derived classes.
///
internal static bool IsUserMinSizePropertyValueValid(object value)
{
double v = (double)value;
return (!DoubleUtil.IsNaN(v) && v >= 0.0d && !Double.IsPositiveInfinity(v));
}
///
///
///
/// This method needs to be internal to be accessable from derived classes.
///
internal static void OnUserMaxSizePropertyChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)
{
DefinitionBase definition = (DefinitionBase) d;
if (definition.InParentLogicalTree)
{
Grid parentGrid = (Grid) definition.Parent;
parentGrid.InvalidateMeasure();
}
}
///
///
///
/// This method needs to be internal to be accessable from derived classes.
///
internal static bool IsUserMaxSizePropertyValueValid(object value)
{
double v = (double)value;
return (!DoubleUtil.IsNaN(v) && v >= 0.0d);
}
///
///
///
/// This method reflects Grid.SharedScopeProperty state by setting / clearing
/// dynamic property PrivateSharedSizeScopeProperty. Value of PrivateSharedSizeScopeProperty
/// is a collection of SharedSizeState objects for the scope.
/// Also PrivateSharedSizeScopeProperty is FrameworkPropertyMetadataOptions.Inherits property. So that all children
/// elements belonging to a certain scope can easily access SharedSizeState collection. As well
/// as been norified about enter / exit a scope.
///
internal static void OnIsSharedSizeScopePropertyChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)
{
//
if ((bool) e.NewValue)
{
SharedSizeScope sharedStatesCollection = new SharedSizeScope();
d.SetValue(PrivateSharedSizeScopeProperty, sharedStatesCollection);
}
else
{
d.ClearValue(PrivateSharedSizeScopeProperty);
}
}
#endregion Internal Methods
//-----------------------------------------------------
//
// Internal Properties
//
//------------------------------------------------------
#region Internal Properties
///
/// Returns true if this definition is a part of shared group.
///
internal bool IsShared
{
get { return (_sharedState != null); }
}
///
/// Internal accessor to user size field.
///
internal GridLength UserSize
{
get { return (_sharedState != null ? _sharedState.UserSize : UserSizeValueCache); }
}
///
/// Internal accessor to user min size field.
///
internal double UserMinSize
{
get { return (UserMinSizeValueCache); }
}
///
/// Internal accessor to user max size field.
///
internal double UserMaxSize
{
get { return (UserMaxSizeValueCache); }
}
///
/// DefinitionBase's index in the parents collection.
///
internal int Index
{
get
{
return (_parentIndex);
}
set
{
Debug.Assert(value >= -1 && _parentIndex != value);
_parentIndex = value;
}
}
///
/// Layout-time user size type.
///
internal Grid.LayoutTimeSizeType SizeType
{
get { return (_sizeType); }
set { _sizeType = value; }
}
///
/// Returns or sets measure size for the definition.
///
internal double MeasureSize
{
get { return (_measureSize); }
set { _measureSize = value; }
}
///
/// Returns definition's layout time type sensitive preferred size.
///
///
/// Returned value is guaranteed to be true preferred size.
///
internal double PreferredSize
{
get
{
double preferredSize = MinSize;
if ( _sizeType != Grid.LayoutTimeSizeType.Auto
&& preferredSize < _measureSize )
{
preferredSize = _measureSize;
}
return (preferredSize);
}
}
///
/// Returns or sets size cache for the definition.
///
internal double SizeCache
{
get { return (_sizeCache); }
set { _sizeCache = value; }
}
///
/// Returns min size.
///
internal double MinSize
{
get
{
double minSize = _minSize;
if ( UseSharedMinimum
&& _sharedState != null
&& minSize < _sharedState.MinSize )
{
minSize = _sharedState.MinSize;
}
return (minSize);
}
}
///
/// Returns min size, always taking into account shared state.
///
internal double MinSizeForArrange
{
get
{
double minSize = _minSize;
if ( _sharedState != null
&& (UseSharedMinimum || !LayoutWasUpdated)
&& minSize < _sharedState.MinSize )
{
minSize = _sharedState.MinSize;
}
return (minSize);
}
}
///
/// Offset.
///
internal double FinalOffset
{
get { return _offset; }
set { _offset = value; }
}
///
/// Internal helper to access up-to-date UserSize property value.
///
internal GridLength UserSizeValueCache
{
get
{
return (GridLength) GetValue(
_isColumnDefinition ?
ColumnDefinition.WidthProperty :
RowDefinition.HeightProperty);
}
}
///
/// Internal helper to access up-to-date UserMinSize property value.
///
internal double UserMinSizeValueCache
{
get
{
return (double) GetValue(
_isColumnDefinition ?
ColumnDefinition.MinWidthProperty :
RowDefinition.MinHeightProperty);
}
}
///
/// Internal helper to access up-to-date UserMaxSize property value.
///
internal double UserMaxSizeValueCache
{
get
{
return (double) GetValue(
_isColumnDefinition ?
ColumnDefinition.MaxWidthProperty :
RowDefinition.MaxHeightProperty);
}
}
///
/// Protected. Returns true if this DefinitionBase instance is in parent's logical tree.
///
internal bool InParentLogicalTree
{
get { return (_parentIndex != -1); }
}
#endregion Internal Properties
//-----------------------------------------------------
//
// Private Methods
//
//-----------------------------------------------------
#region Private Methods
///
/// SetFlags is used to set or unset one or multiple
/// flags on the object.
///
private void SetFlags(bool value, Flags flags)
{
_flags = value ? (_flags | flags) : (_flags & (~flags));
}
///
/// CheckFlagsAnd returns true if all the flags in the
/// given bitmask are set on the object.
///
private bool CheckFlagsAnd(Flags flags)
{
return ((_flags & flags) == flags);
}
///
///
private static void OnSharedSizeGroupPropertyChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)
{
DefinitionBase definition = (DefinitionBase) d;
if (definition.InParentLogicalTree)
{
string sharedSizeGroupId = (string) e.NewValue;
if (definition._sharedState != null)
{
// if definition is already registered AND shared size group id is changing,
// then un-register the definition from the current shared size state object.
definition._sharedState.RemoveMember(definition);
definition._sharedState = null;
}
if ((definition._sharedState == null) && (sharedSizeGroupId != null))
{
SharedSizeScope privateSharedSizeScope = definition.PrivateSharedSizeScope;
if (privateSharedSizeScope != null)
{
// if definition is not registered and both: shared size group id AND private shared scope
// are available, then register definition.
definition._sharedState = privateSharedSizeScope.EnsureSharedState(sharedSizeGroupId);
definition._sharedState.AddMember(definition);
}
}
}
}
///
///
///
/// Verifies that Shared Size Group Property string
/// a) not empty.
/// b) contains only letters, digits and underscore ('_').
/// c) does not start with a digit.
///
private static bool SharedSizeGroupPropertyValueValid(object value)
{
// null is default value
if (value == null)
{
return (true);
}
string id = (string)value;
if (id != string.Empty)
{
int i = -1;
while (++i < id.Length)
{
bool isDigit = Char.IsDigit(id[i]);
if ( (i == 0 && isDigit)
|| !( isDigit
|| Char.IsLetter(id[i])
|| '_' == id[i] ) )
{
break;
}
}
if (i == id.Length)
{
return (true);
}
}
return (false);
}
///
///
///
/// OnPrivateSharedSizeScopePropertyChanged is called when new scope enters or
/// existing scope just left. In both cases if the DefinitionBase object is already registered
/// in SharedSizeState, it should un-register and register itself in a new one.
///
private static void OnPrivateSharedSizeScopePropertyChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)
{
DefinitionBase definition = (DefinitionBase)d;
if (definition.InParentLogicalTree)
{
SharedSizeScope privateSharedSizeScope = (SharedSizeScope) e.NewValue;
if (definition._sharedState != null)
{
// if definition is already registered And shared size scope is changing,
// then un-register the definition from the current shared size state object.
definition._sharedState.RemoveMember(definition);
definition._sharedState = null;
}
if ((definition._sharedState == null) && (privateSharedSizeScope != null))
{
string sharedSizeGroup = definition.SharedSizeGroup;
if (sharedSizeGroup != null)
{
// if definition is not registered and both: shared size group id AND private shared scope
// are available, then register definition.
definition._sharedState = privateSharedSizeScope.EnsureSharedState(definition.SharedSizeGroup);
definition._sharedState.AddMember(definition);
}
}
}
}
#endregion Private Methods
//-----------------------------------------------------
//
// Private Properties
//
//------------------------------------------------------
#region Private Properties
///
/// Private getter of shared state collection dynamic property.
///
private SharedSizeScope PrivateSharedSizeScope
{
get { return (SharedSizeScope) GetValue(PrivateSharedSizeScopeProperty); }
}
///
/// Convenience accessor to UseSharedMinimum flag
///
private bool UseSharedMinimum
{
get { return (CheckFlagsAnd(Flags.UseSharedMinimum)); }
set { SetFlags(value, Flags.UseSharedMinimum); }
}
///
/// Convenience accessor to LayoutWasUpdated flag
///
private bool LayoutWasUpdated
{
get { return (CheckFlagsAnd(Flags.LayoutWasUpdated)); }
set { SetFlags(value, Flags.LayoutWasUpdated); }
}
#endregion Private Properties
//-----------------------------------------------------
//
// Private Fields
//
//------------------------------------------------------
#region Private Fields
private readonly bool _isColumnDefinition; // when "true", this is a ColumnDefinition; when "false" this is a RowDefinition (faster than a type check)
private Flags _flags; // flags reflecting various aspects of internal state
private int _parentIndex; // this instance's index in parent's children collection
private Grid.LayoutTimeSizeType _sizeType; // layout-time user size type. it may differ from _userSizeValueCache.UnitType when calculating "to-content"
private double _minSize; // used during measure to accumulate size for "Auto" and "Star" DefinitionBase's
private double _measureSize; // size, calculated to be the input contstraint size for Child.Measure
private double _sizeCache; // cache used for various purposes (sorting, caching, etc) during calculations
private double _offset; // offset of the DefinitionBase from left / top corner (assuming LTR case)
private SharedSizeState _sharedState; // reference to shared state object this instance is registered with
internal const bool ThisIsColumnDefinition = true;
internal const bool ThisIsRowDefinition = false;
#endregion Private Fields
//------------------------------------------------------
//
// Private Structures / Classes
//
//-----------------------------------------------------
#region Private Structures Classes
[System.Flags]
private enum Flags : byte
{
//
// bool flags
//
UseSharedMinimum = 0x00000020, // when "1", definition will take into account shared state's minimum
LayoutWasUpdated = 0x00000040, // set to "1" every time the parent grid is measured
}
///
/// Collection of shared states objects for a single scope
///
private class SharedSizeScope
{
///
/// Returns SharedSizeState object for a given group.
/// Creates a new StatedState object if necessary.
///
internal SharedSizeState EnsureSharedState(string sharedSizeGroup)
{
// check that sharedSizeGroup is not default
Debug.Assert(sharedSizeGroup != null);
SharedSizeState sharedState = _registry[sharedSizeGroup] as SharedSizeState;
if (sharedState == null)
{
sharedState = new SharedSizeState(this, sharedSizeGroup);
_registry[sharedSizeGroup] = sharedState;
}
return (sharedState);
}
///
/// Removes an entry in the registry by the given key.
///
internal void Remove(object key)
{
Debug.Assert(_registry.Contains(key));
_registry.Remove(key);
}
private Hashtable _registry = new Hashtable(); // storage for shared state objects
}
///
/// Implementation of per shared group state object
///
private class SharedSizeState
{
///
/// Default ctor.
///
internal SharedSizeState(SharedSizeScope sharedSizeScope, string sharedSizeGroupId)
{
Debug.Assert(sharedSizeScope != null && sharedSizeGroupId != null);
_sharedSizeScope = sharedSizeScope;
_sharedSizeGroupId = sharedSizeGroupId;
_registry = new List();
_layoutUpdated = new EventHandler(OnLayoutUpdated);
_broadcastInvalidation = true;
}
///
/// Adds / registers a definition instance.
///
internal void AddMember(DefinitionBase member)
{
Debug.Assert(!_registry.Contains(member));
_registry.Add(member);
Invalidate();
}
///
/// Removes / un-registers a definition instance.
///
///
/// If the collection of registered definitions becomes empty
/// instantiates self removal from owner's collection.
///
internal void RemoveMember(DefinitionBase member)
{
Invalidate();
_registry.Remove(member);
if (_registry.Count == 0)
{
_sharedSizeScope.Remove(_sharedSizeGroupId);
}
}
///
/// Propogates invalidations for all registered definitions.
/// Resets its own state.
///
internal void Invalidate()
{
_userSizeValid = false;
if (_broadcastInvalidation)
{
for (int i = 0, count = _registry.Count; i < count; ++i)
{
Grid parentGrid = (Grid)(_registry[i].Parent);
parentGrid.Invalidate();
}
_broadcastInvalidation = false;
}
}
///
/// Makes sure that one and only one layout updated handler is registered for this shared state.
///
internal void EnsureDeferredValidation(UIElement layoutUpdatedHost)
{
if (_layoutUpdatedHost == null)
{
_layoutUpdatedHost = layoutUpdatedHost;
_layoutUpdatedHost.LayoutUpdated += _layoutUpdated;
}
}
///
/// DefinitionBase's specific code.
///
internal double MinSize
{
get
{
if (!_userSizeValid) { EnsureUserSizeValid(); }
return (_minSize);
}
}
///
/// DefinitionBase's specific code.
///
internal GridLength UserSize
{
get
{
if (!_userSizeValid) { EnsureUserSizeValid(); }
return (_userSize);
}
}
private void EnsureUserSizeValid()
{
_userSize = new GridLength(1, GridUnitType.Auto);
for (int i = 0, count = _registry.Count; i < count; ++i)
{
Debug.Assert( _userSize.GridUnitType == GridUnitType.Auto
|| _userSize.GridUnitType == GridUnitType.Pixel );
GridLength currentGridLength = _registry[i].UserSizeValueCache;
if (currentGridLength.GridUnitType == GridUnitType.Pixel)
{
if (_userSize.GridUnitType == GridUnitType.Auto)
{
_userSize = currentGridLength;
}
else if (_userSize.Value < currentGridLength.Value)
{
_userSize = currentGridLength;
}
}
}
// taking maximum with user size effectively prevents squishy-ness.
// this is a "solution" to avoid shared definitions from been sized to
// different final size at arrange time, if / when different grids receive
// different final sizes.
_minSize = _userSize.IsAbsolute ? _userSize.Value : 0.0;
_userSizeValid = true;
}
///
/// OnLayoutUpdated handler. Validates that all participating definitions
/// have updated min size value. Forces another layout update cycle if needed.
///
private void OnLayoutUpdated(object sender, EventArgs e)
{
double sharedMinSize = 0;
// accumulate min size of all participating definitions
for (int i = 0, count = _registry.Count; i < count; ++i)
{
sharedMinSize = Math.Max(sharedMinSize, _registry[i].MinSize);
}
bool sharedMinSizeChanged = !DoubleUtil.AreClose(_minSize, sharedMinSize);
// compare accumulated min size with min sizes of the individual definitions
for (int i = 0, count = _registry.Count; i < count; ++i)
{
DefinitionBase definitionBase = _registry[i];
if (sharedMinSizeChanged || definitionBase.LayoutWasUpdated)
{
// if definition's min size is different, then need to re-measure
if (!DoubleUtil.AreClose(sharedMinSize, definitionBase.MinSize))
{
Grid parentGrid = (Grid)definitionBase.Parent;
parentGrid.InvalidateMeasure();
definitionBase.UseSharedMinimum = true;
}
else
{
definitionBase.UseSharedMinimum = false;
// if measure is valid then also need to check arrange.
// Note: definitionBase.SizeCache is volatile but at this point
// it contains up-to-date final size
if (!DoubleUtil.AreClose(sharedMinSize, definitionBase.SizeCache))
{
Grid parentGrid = (Grid)definitionBase.Parent;
parentGrid.InvalidateArrange();
}
}
definitionBase.LayoutWasUpdated = false;
}
}
_minSize = sharedMinSize;
_layoutUpdatedHost.LayoutUpdated -= _layoutUpdated;
_layoutUpdatedHost = null;
_broadcastInvalidation = true;
}
private readonly SharedSizeScope _sharedSizeScope; // the scope this state belongs to
private readonly string _sharedSizeGroupId; // Id of the shared size group this object is servicing
private readonly List _registry; // registry of participating definitions
private readonly EventHandler _layoutUpdated; // instance event handler for layout updated event
private UIElement _layoutUpdatedHost; // UIElement for which layout updated event handler is registered
private bool _broadcastInvalidation; // "true" when broadcasting of invalidation is needed
private bool _userSizeValid; // "true" when _userSize is up to date
private GridLength _userSize; // shared state
private double _minSize; // shared state
}
#endregion Private Structures Classes
//------------------------------------------------------
//
// Properties
//
//-----------------------------------------------------
#region Properties
///
/// Private shared size scope property holds a collection of shared state objects for the a given shared size scope.
///
internal static readonly DependencyProperty PrivateSharedSizeScopeProperty =
DependencyProperty.RegisterAttached(
"PrivateSharedSizeScope",
typeof(SharedSizeScope),
typeof(DefinitionBase),
new FrameworkPropertyMetadata(
null,
FrameworkPropertyMetadataOptions.Inherits));
///
/// Shared size group property marks column / row definition as belonging to a group "Foo" or "Bar".
///
///
/// Value of the Shared Size Group Property must satisfy the following rules:
///
///
/// String must not be empty.
///
/// String must consist of letters, digits and underscore ('_') only.
///
/// String must not start with a digit.
///
///
public static readonly DependencyProperty SharedSizeGroupProperty =
DependencyProperty.Register(
"SharedSizeGroup",
typeof(string),
typeof(DefinitionBase),
new FrameworkPropertyMetadata(new PropertyChangedCallback(OnSharedSizeGroupPropertyChanged)),
new ValidateValueCallback(SharedSizeGroupPropertyValueValid));
///
/// Static ctor. Used for static registration of properties.
///
static DefinitionBase()
{
PrivateSharedSizeScopeProperty.OverrideMetadata(
typeof(DefinitionBase),
new FrameworkPropertyMetadata(new PropertyChangedCallback(OnPrivateSharedSizeScopePropertyChanged)));
}
#endregion Properties
}
}
// File provided for Reference Use Only by Microsoft Corporation (c) 2007.
// Copyright (c) Microsoft Corporation. All rights reserved.
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