Code:
/ 4.0 / 4.0 / untmp / DEVDIV_TFS / Dev10 / Releases / RTMRel / wpf / src / Framework / System / Windows / Controls / Primitives / UniformGrid.cs / 1305600 / UniformGrid.cs
//---------------------------------------------------------------------------- // // Copyright (C) Microsoft Corporation. All rights reserved. // //--------------------------------------------------------------------------- //--------------------------------------------------------------------------- // // File: UniformGrid.cs // // Description: Implementation of a UniformGrid that evenly distributes // space among its children // // NewsClient is defining this Panel because it wants a // multi-row, multi-column display of news items in the Pod; // Grid can be databound, but it does not do auto-indexing, // meaning that all of the generated items would be laid out // on top of each other. Rather than subclassing Grid to // introduce this auto-indexing behavior, it seemed more // straightforward to construct this straightforward panel. // // NOTE: this is grabed from JeffBog's NewsClient under // windows\wcp\DevTest\Demos\NewsClient\Core and add a FirstColumn property. // //--------------------------------------------------------------------------- using System; using System.ComponentModel; using System.Windows; using System.Windows.Controls; using System.Windows.Media; namespace System.Windows.Controls.Primitives { ////// UniformGrid is used to arrange children in a grid with all equal cell sizes. /// public class UniformGrid : Panel { //-------------------------------------------------------------------- // // Constructors // //------------------------------------------------------------------- #region Constructors ////// Default constructor. /// public UniformGrid() : base() { } #endregion Constructors //-------------------------------------------------------------------- // // Public Properties // //-------------------------------------------------------------------- #region Public Properties ////// the start column to arrange children. Leave first 'FirstColumn' /// cells blank. /// public int FirstColumn { get { return (int)GetValue(FirstColumnProperty); } set { SetValue(FirstColumnProperty, value); } } ////// FirstColumnProperty /// public static readonly DependencyProperty FirstColumnProperty = DependencyProperty.Register( "FirstColumn", typeof(int), typeof(UniformGrid), new FrameworkPropertyMetadata( (int)0, FrameworkPropertyMetadataOptions.AffectsMeasure), new ValidateValueCallback(ValidateFirstColumn)); private static bool ValidateFirstColumn(object o) { return (int)o >= 0; } ////// Specifies the number of columns in the grid /// A value of 0 indicates that the column count should be dynamically /// computed based on the number of rows (if specified) and the /// number of non-collapsed children in the grid /// public int Columns { get { return (int)GetValue(ColumnsProperty); } set { SetValue(ColumnsProperty, value); } } ////// DependencyProperty for public static readonly DependencyProperty ColumnsProperty = DependencyProperty.Register( "Columns", typeof(int), typeof(UniformGrid), new FrameworkPropertyMetadata( (int)0, FrameworkPropertyMetadataOptions.AffectsMeasure), new ValidateValueCallback(ValidateColumns)); private static bool ValidateColumns(object o) { return (int)o >= 0; } ///property. /// /// Specifies the number of rows in the grid /// A value of 0 indicates that the row count should be dynamically /// computed based on the number of columns (if specified) and the /// number of non-collapsed children in the grid /// public int Rows { get { return (int)GetValue(RowsProperty); } set { SetValue(RowsProperty, value); } } ////// DependencyProperty for public static readonly DependencyProperty RowsProperty = DependencyProperty.Register( "Rows", typeof(int), typeof(UniformGrid), new FrameworkPropertyMetadata( (int)0, FrameworkPropertyMetadataOptions.AffectsMeasure), new ValidateValueCallback(ValidateRows)); private static bool ValidateRows(object o) { return (int)o >= 0; } #endregion Public Properties //------------------------------------------------------------------- // // Protected Methods // //-------------------------------------------------------------------- #region Protected Methods ///property. /// /// Compute the desired size of this UniformGrid by measuring all of the /// children with a constraint equal to a cell's portion of the given /// constraint (e.g. for a 2 x 4 grid, the child constraint would be /// constraint.Width*0.5 x constraint.Height*0.25). The maximum child /// width and maximum child height are tracked, and then the desired size /// is computed by multiplying these maximums by the row and column count /// (e.g. for a 2 x 4 grid, the desired size for the UniformGrid would be /// maxChildDesiredWidth*2 x maxChildDesiredHeight*4). /// /// Constraint ///Desired size protected override Size MeasureOverride(Size constraint) { UpdateComputedValues(); Size childConstraint = new Size(constraint.Width / _columns, constraint.Height / _rows); double maxChildDesiredWidth = 0.0; double maxChildDesiredHeight = 0.0; // Measure each child, keeping track of maximum desired width and height. for (int i = 0, count = InternalChildren.Count; i < count; ++i) { UIElement child = InternalChildren[i]; // Measure the child. child.Measure(childConstraint); Size childDesiredSize = child.DesiredSize; if (maxChildDesiredWidth < childDesiredSize.Width) { maxChildDesiredWidth = childDesiredSize.Width; } if (maxChildDesiredHeight < childDesiredSize.Height) { maxChildDesiredHeight = childDesiredSize.Height; } } return new Size((maxChildDesiredWidth * _columns),(maxChildDesiredHeight * _rows)); } ////// Arrange the children of this UniformGrid by distributing space evenly /// among all of the children, making each child the size equal to a cell's /// portion of the given arrangeSize (e.g. for a 2 x 4 grid, the child size /// would be arrangeSize*0.5 x arrangeSize*0.25) /// /// Arrange size protected override Size ArrangeOverride(Size arrangeSize) { Rect childBounds = new Rect(0, 0, arrangeSize.Width / _columns, arrangeSize.Height / _rows); double xStep = childBounds.Width; double xBound = arrangeSize.Width - 1.0; childBounds.X += childBounds.Width * FirstColumn; // Arrange and Position each child to the same cell size foreach (UIElement child in InternalChildren) { child.Arrange(childBounds); // only advance to the next grid cell if the child was not collapsed if (child.Visibility != Visibility.Collapsed) { childBounds.X += xStep; if (childBounds.X >= xBound) { childBounds.Y += childBounds.Height; childBounds.X = 0; } } } return arrangeSize; } #endregion Protected Methods //----------------------------------------------------- // // Private Methods // //----------------------------------------------------- #region Private Methods ////// If either Rows or Columns are set to 0, then dynamically compute these /// values based on the actual number of non-collapsed children. /// /// In the case when both Rows and Columns are set to 0, then make Rows /// and Columns be equal, thus laying out in a square grid. /// private void UpdateComputedValues() { _columns = Columns; _rows = Rows; //parameter checking. if (FirstColumn >= _columns) { //NOTE: maybe we shall throw here. But this is somewhat out of //the MCC itself. We need a whole new panel spec. FirstColumn = 0; } if ((_rows == 0) || (_columns == 0)) { int nonCollapsedCount = 0; // First compute the actual # of non-collapsed children to be laid out for (int i = 0, count = InternalChildren.Count; i < count; ++i) { UIElement child = InternalChildren[i]; if (child.Visibility != Visibility.Collapsed) { nonCollapsedCount++; } } // to ensure that we have at leat one row & column, make sure // that nonCollapsedCount is at least 1 if (nonCollapsedCount == 0) { nonCollapsedCount = 1; } if (_rows == 0) { if (_columns > 0) { // take FirstColumn into account, because it should really affect the result _rows = (nonCollapsedCount + FirstColumn + (_columns - 1)) / _columns; } else { // both rows and columns are unset -- lay out in a square _rows = (int)Math.Sqrt(nonCollapsedCount); if ((_rows * _rows) < nonCollapsedCount) { _rows++; } _columns = _rows; } } else if (_columns == 0) { // guaranteed that _rows is not 0, because we're in the else clause of the check for _rows == 0 _columns = (nonCollapsedCount + (_rows - 1)) / _rows; } } } #endregion Private Properties private int _rows; private int _columns; } } // File provided for Reference Use Only by Microsoft Corporation (c) 2007. // Copyright (c) Microsoft Corporation. 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