Code:
/ 4.0 / 4.0 / DEVDIV_TFS / Dev10 / Releases / RTMRel / ndp / cdf / src / WF / Common / AuthoringOM / Design / MessageFilters / ZoomingMessageFilter.cs / 1305376 / ZoomingMessageFilter.cs
namespace System.Workflow.ComponentModel.Design
{
using System;
using System.Drawing;
using System.Diagnostics;
using System.Windows.Forms;
using System.ComponentModel.Design;
#region Class ZoomingMessageFilter
///This MessageFilter needs coordinates in client coordinate system
internal sealed class ZoomingMessageFilter : WorkflowDesignerMessageFilter
{
#region Members and Constructor
private static int ZoomIncrement = 20;
private static Cursor ZoomInCursor = new Cursor(typeof(WorkflowView), "Resources.zoomin.cur");
private static Cursor ZoomOutCursor = new Cursor(typeof(WorkflowView), "Resources.zoomout.cur");
private static Cursor ZoomDisabledCursor = new Cursor(typeof(WorkflowView), "Resources.zoomno.cur");
private enum ZoomState { In, Out }
private ZoomState initialState = ZoomState.In; //which tool to show by default
private ZoomState currentState = ZoomState.In; //current tool
private DragRectangleMessageFilter fastZoomingMessageFilter = null;
private CommandID previousCommand;
private Cursor previousCursor = Cursors.Default;
internal ZoomingMessageFilter(bool initiateZoomIn)
{
this.currentState = this.initialState = (initiateZoomIn) ? ZoomState.In : ZoomState.Out;
}
#endregion
#region MessageFilter Overrides
protected override void Initialize(WorkflowView parentView)
{
base.Initialize(parentView);
StoreUIState();
RefreshUIState();
}
protected override void Dispose(bool disposing)
{
try
{
if (this.fastZoomingMessageFilter != null)
{
this.fastZoomingMessageFilter.DragComplete -= new EventHandler(OnZoomRectComplete);
ParentView.RemoveDesignerMessageFilter(this.fastZoomingMessageFilter);
this.fastZoomingMessageFilter.Dispose();
this.fastZoomingMessageFilter = null;
}
RestoreUIState();
}
finally
{
base.Dispose(disposing);
}
}
protected override bool OnShowContextMenu(Point menuPoint)
{
IMenuCommandService menuCommandService = (IMenuCommandService)GetService(typeof(IMenuCommandService));
if (menuCommandService != null)
{
menuCommandService.ShowContextMenu(WorkflowMenuCommands.ZoomMenu, menuPoint.X, menuPoint.Y);
RefreshUIState();
}
return true;
}
protected override bool OnMouseEnter(MouseEventArgs eventArgs)
{
RefreshUIState();
return true;
}
protected override bool OnMouseDown(MouseEventArgs eventArgs)
{
if (eventArgs.Button == MouseButtons.Left)
{
this.currentState = ((Control.ModifierKeys & Keys.Shift) != 0) ? ((this.initialState == ZoomState.In) ? ZoomState.Out : ZoomState.In) : this.initialState;
bool forwardMessage = (this.fastZoomingMessageFilter == null);
RefreshUIState();
if (forwardMessage && this.fastZoomingMessageFilter != null)
((IWorkflowDesignerMessageSink)this.fastZoomingMessageFilter).OnMouseDown(eventArgs);
}
return true;
}
protected override bool OnMouseMove(MouseEventArgs eventArgs)
{
//We do not allow other behaviors to handle this message
return true;
}
protected override bool OnMouseDoubleClick(MouseEventArgs eventArgs)
{
return true;
}
protected override bool OnMouseLeave()
{
return true;
}
protected override bool OnMouseCaptureChanged()
{
return true;
}
protected override bool OnMouseUp(MouseEventArgs eventArgs)
{
if (eventArgs.Button == MouseButtons.Left && CanContinueZooming)
{
WorkflowView parentView = ParentView;
int zoom = parentView.Zoom + ((this.currentState == ZoomState.In) ? ZoomingMessageFilter.ZoomIncrement : (-1 * ZoomingMessageFilter.ZoomIncrement));
Point center = new Point((this.currentState == ZoomState.In) ? eventArgs.X : parentView.ViewPortSize.Width / 2, (this.currentState == ZoomState.In) ? eventArgs.Y : parentView.ViewPortSize.Height / 2);
UpdateZoom(zoom, center);
}
return true;
}
protected override bool OnKeyDown(KeyEventArgs eventArgs)
{
if (eventArgs.KeyValue == (int)Keys.Escape)
{
ParentView.RemoveDesignerMessageFilter(this);
}
else
{
this.currentState = ((eventArgs.Modifiers & Keys.Shift) != 0) ? ((this.initialState == ZoomState.In) ? ZoomState.Out : ZoomState.In) : this.initialState;
RefreshUIState();
}
return true;
}
protected override bool OnKeyUp(KeyEventArgs eventArgs)
{
this.currentState = ((eventArgs.Modifiers & Keys.Shift) != 0) ? ((this.initialState == ZoomState.In) ? ZoomState.Out : ZoomState.In) : this.initialState;
RefreshUIState();
return true;
}
protected override bool OnDragEnter(DragEventArgs eventArgs)
{
ParentView.RemoveDesignerMessageFilter(this);
return false;
}
#endregion
#region Helpers
internal bool ZoomingIn
{
get
{
return (this.initialState == ZoomState.In);
}
}
private void OnZoomRectComplete(object sender, EventArgs e)
{
Debug.Assert(this.currentState == ZoomState.In && CanContinueZooming && this.fastZoomingMessageFilter != null);
if (CanContinueZooming && this.currentState == ZoomState.In && this.fastZoomingMessageFilter != null && !this.fastZoomingMessageFilter.DragRectangle.IsEmpty)
{
Rectangle dragRectangle = this.fastZoomingMessageFilter.DragRectangle;
WorkflowView parentView = ParentView;
Point center = parentView.LogicalPointToClient(new Point(dragRectangle.Location.X + dragRectangle.Width / 2, dragRectangle.Location.Y + dragRectangle.Height / 2));
int zoom = (int)(Math.Min((float)parentView.ViewPortSize.Width / (float)dragRectangle.Width, (float)parentView.ViewPortSize.Height / (float)dragRectangle.Height) * 100.0f);
UpdateZoom(zoom, center);
}
}
private void UpdateZoom(int zoomLevel, Point center)
{
PointF relativeCenterF = PointF.Empty;
WorkflowView parentView = ParentView;
Point layoutOrigin = parentView.LogicalPointToClient(Point.Empty);
center.X -= layoutOrigin.X; center.Y -= layoutOrigin.Y;
relativeCenterF = new PointF((float)center.X / (float)parentView.HScrollBar.Maximum, (float)center.Y / (float)parentView.VScrollBar.Maximum);
parentView.Zoom = Math.Min(Math.Max(zoomLevel, AmbientTheme.MinZoom), AmbientTheme.MaxZoom);
Point newCenter = new Point((int)((float)parentView.HScrollBar.Maximum * relativeCenterF.X), (int)((float)parentView.VScrollBar.Maximum * relativeCenterF.Y));
parentView.ScrollPosition = new Point(newCenter.X - parentView.HScrollBar.LargeChange / 2, newCenter.Y - parentView.VScrollBar.LargeChange / 2);
this.currentState = ((Control.ModifierKeys & Keys.Shift) != 0) ? ((this.initialState == ZoomState.In) ? ZoomState.Out : ZoomState.In) : this.initialState;
RefreshUIState();
}
private bool CanContinueZooming
{
get
{
WorkflowView parentView = ParentView;
return ((this.currentState == ZoomState.Out && parentView.Zoom > AmbientTheme.MinZoom) || (this.currentState == ZoomState.In && parentView.Zoom < AmbientTheme.MaxZoom));
}
}
private void StoreUIState()
{
IMenuCommandService menuCommandService = GetService(typeof(IMenuCommandService)) as IMenuCommandService;
if (menuCommandService != null)
{
foreach (CommandID affectedCommand in CommandSet.NavigationToolCommandIds)
{
MenuCommand menuCommand = menuCommandService.FindCommand(affectedCommand);
if (menuCommand != null && menuCommand.Enabled && menuCommand.Checked)
{
this.previousCommand = menuCommand.CommandID;
break;
}
}
}
this.previousCursor = ParentView.Cursor;
}
private void RestoreUIState()
{
IMenuCommandService menuCommandService = GetService(typeof(IMenuCommandService)) as IMenuCommandService;
if (menuCommandService != null)
{
foreach (CommandID affectedCommand in CommandSet.NavigationToolCommandIds)
{
MenuCommand menuCommand = menuCommandService.FindCommand(affectedCommand);
if (menuCommand != null && menuCommand.Enabled)
menuCommand.Checked = (menuCommand.CommandID == this.previousCommand);
}
}
ParentView.Cursor = this.previousCursor;
}
private void RefreshUIState()
{
//Update the cursor
WorkflowView parentView = ParentView;
if (!CanContinueZooming)
parentView.Cursor = ZoomingMessageFilter.ZoomDisabledCursor;
else if (this.currentState == ZoomState.In)
parentView.Cursor = ZoomingMessageFilter.ZoomInCursor;
else
parentView.Cursor = ZoomingMessageFilter.ZoomOutCursor;
//Update the fast zoom
if (this.fastZoomingMessageFilter == null && CanContinueZooming && this.currentState == ZoomState.In)
{
this.fastZoomingMessageFilter = new DragRectangleMessageFilter();
this.fastZoomingMessageFilter.DragComplete += new EventHandler(OnZoomRectComplete);
parentView.AddDesignerMessageFilter(this.fastZoomingMessageFilter);
}
else if (this.fastZoomingMessageFilter != null && (!CanContinueZooming || this.currentState != ZoomState.In))
{
this.fastZoomingMessageFilter.DragComplete -= new EventHandler(OnZoomRectComplete);
parentView.RemoveDesignerMessageFilter(this.fastZoomingMessageFilter);
this.fastZoomingMessageFilter = null;
}
//Update the menu
IMenuCommandService menuCommandService = GetService(typeof(IMenuCommandService)) as IMenuCommandService;
if (menuCommandService != null)
{
foreach (CommandID affectedCommand in CommandSet.NavigationToolCommandIds)
{
MenuCommand menuCommand = menuCommandService.FindCommand(affectedCommand);
if (menuCommand != null && menuCommand.Enabled)
menuCommand.Checked = (menuCommand.CommandID == ((this.initialState == ZoomState.In) ? WorkflowMenuCommands.ZoomIn : WorkflowMenuCommands.ZoomOut));
}
}
}
#endregion
}
#endregion
}
// File provided for Reference Use Only by Microsoft Corporation (c) 2007.
// Copyright (c) Microsoft Corporation. All rights reserved.
namespace System.Workflow.ComponentModel.Design
{
using System;
using System.Drawing;
using System.Diagnostics;
using System.Windows.Forms;
using System.ComponentModel.Design;
#region Class ZoomingMessageFilter
///This MessageFilter needs coordinates in client coordinate system
internal sealed class ZoomingMessageFilter : WorkflowDesignerMessageFilter
{
#region Members and Constructor
private static int ZoomIncrement = 20;
private static Cursor ZoomInCursor = new Cursor(typeof(WorkflowView), "Resources.zoomin.cur");
private static Cursor ZoomOutCursor = new Cursor(typeof(WorkflowView), "Resources.zoomout.cur");
private static Cursor ZoomDisabledCursor = new Cursor(typeof(WorkflowView), "Resources.zoomno.cur");
private enum ZoomState { In, Out }
private ZoomState initialState = ZoomState.In; //which tool to show by default
private ZoomState currentState = ZoomState.In; //current tool
private DragRectangleMessageFilter fastZoomingMessageFilter = null;
private CommandID previousCommand;
private Cursor previousCursor = Cursors.Default;
internal ZoomingMessageFilter(bool initiateZoomIn)
{
this.currentState = this.initialState = (initiateZoomIn) ? ZoomState.In : ZoomState.Out;
}
#endregion
#region MessageFilter Overrides
protected override void Initialize(WorkflowView parentView)
{
base.Initialize(parentView);
StoreUIState();
RefreshUIState();
}
protected override void Dispose(bool disposing)
{
try
{
if (this.fastZoomingMessageFilter != null)
{
this.fastZoomingMessageFilter.DragComplete -= new EventHandler(OnZoomRectComplete);
ParentView.RemoveDesignerMessageFilter(this.fastZoomingMessageFilter);
this.fastZoomingMessageFilter.Dispose();
this.fastZoomingMessageFilter = null;
}
RestoreUIState();
}
finally
{
base.Dispose(disposing);
}
}
protected override bool OnShowContextMenu(Point menuPoint)
{
IMenuCommandService menuCommandService = (IMenuCommandService)GetService(typeof(IMenuCommandService));
if (menuCommandService != null)
{
menuCommandService.ShowContextMenu(WorkflowMenuCommands.ZoomMenu, menuPoint.X, menuPoint.Y);
RefreshUIState();
}
return true;
}
protected override bool OnMouseEnter(MouseEventArgs eventArgs)
{
RefreshUIState();
return true;
}
protected override bool OnMouseDown(MouseEventArgs eventArgs)
{
if (eventArgs.Button == MouseButtons.Left)
{
this.currentState = ((Control.ModifierKeys & Keys.Shift) != 0) ? ((this.initialState == ZoomState.In) ? ZoomState.Out : ZoomState.In) : this.initialState;
bool forwardMessage = (this.fastZoomingMessageFilter == null);
RefreshUIState();
if (forwardMessage && this.fastZoomingMessageFilter != null)
((IWorkflowDesignerMessageSink)this.fastZoomingMessageFilter).OnMouseDown(eventArgs);
}
return true;
}
protected override bool OnMouseMove(MouseEventArgs eventArgs)
{
//We do not allow other behaviors to handle this message
return true;
}
protected override bool OnMouseDoubleClick(MouseEventArgs eventArgs)
{
return true;
}
protected override bool OnMouseLeave()
{
return true;
}
protected override bool OnMouseCaptureChanged()
{
return true;
}
protected override bool OnMouseUp(MouseEventArgs eventArgs)
{
if (eventArgs.Button == MouseButtons.Left && CanContinueZooming)
{
WorkflowView parentView = ParentView;
int zoom = parentView.Zoom + ((this.currentState == ZoomState.In) ? ZoomingMessageFilter.ZoomIncrement : (-1 * ZoomingMessageFilter.ZoomIncrement));
Point center = new Point((this.currentState == ZoomState.In) ? eventArgs.X : parentView.ViewPortSize.Width / 2, (this.currentState == ZoomState.In) ? eventArgs.Y : parentView.ViewPortSize.Height / 2);
UpdateZoom(zoom, center);
}
return true;
}
protected override bool OnKeyDown(KeyEventArgs eventArgs)
{
if (eventArgs.KeyValue == (int)Keys.Escape)
{
ParentView.RemoveDesignerMessageFilter(this);
}
else
{
this.currentState = ((eventArgs.Modifiers & Keys.Shift) != 0) ? ((this.initialState == ZoomState.In) ? ZoomState.Out : ZoomState.In) : this.initialState;
RefreshUIState();
}
return true;
}
protected override bool OnKeyUp(KeyEventArgs eventArgs)
{
this.currentState = ((eventArgs.Modifiers & Keys.Shift) != 0) ? ((this.initialState == ZoomState.In) ? ZoomState.Out : ZoomState.In) : this.initialState;
RefreshUIState();
return true;
}
protected override bool OnDragEnter(DragEventArgs eventArgs)
{
ParentView.RemoveDesignerMessageFilter(this);
return false;
}
#endregion
#region Helpers
internal bool ZoomingIn
{
get
{
return (this.initialState == ZoomState.In);
}
}
private void OnZoomRectComplete(object sender, EventArgs e)
{
Debug.Assert(this.currentState == ZoomState.In && CanContinueZooming && this.fastZoomingMessageFilter != null);
if (CanContinueZooming && this.currentState == ZoomState.In && this.fastZoomingMessageFilter != null && !this.fastZoomingMessageFilter.DragRectangle.IsEmpty)
{
Rectangle dragRectangle = this.fastZoomingMessageFilter.DragRectangle;
WorkflowView parentView = ParentView;
Point center = parentView.LogicalPointToClient(new Point(dragRectangle.Location.X + dragRectangle.Width / 2, dragRectangle.Location.Y + dragRectangle.Height / 2));
int zoom = (int)(Math.Min((float)parentView.ViewPortSize.Width / (float)dragRectangle.Width, (float)parentView.ViewPortSize.Height / (float)dragRectangle.Height) * 100.0f);
UpdateZoom(zoom, center);
}
}
private void UpdateZoom(int zoomLevel, Point center)
{
PointF relativeCenterF = PointF.Empty;
WorkflowView parentView = ParentView;
Point layoutOrigin = parentView.LogicalPointToClient(Point.Empty);
center.X -= layoutOrigin.X; center.Y -= layoutOrigin.Y;
relativeCenterF = new PointF((float)center.X / (float)parentView.HScrollBar.Maximum, (float)center.Y / (float)parentView.VScrollBar.Maximum);
parentView.Zoom = Math.Min(Math.Max(zoomLevel, AmbientTheme.MinZoom), AmbientTheme.MaxZoom);
Point newCenter = new Point((int)((float)parentView.HScrollBar.Maximum * relativeCenterF.X), (int)((float)parentView.VScrollBar.Maximum * relativeCenterF.Y));
parentView.ScrollPosition = new Point(newCenter.X - parentView.HScrollBar.LargeChange / 2, newCenter.Y - parentView.VScrollBar.LargeChange / 2);
this.currentState = ((Control.ModifierKeys & Keys.Shift) != 0) ? ((this.initialState == ZoomState.In) ? ZoomState.Out : ZoomState.In) : this.initialState;
RefreshUIState();
}
private bool CanContinueZooming
{
get
{
WorkflowView parentView = ParentView;
return ((this.currentState == ZoomState.Out && parentView.Zoom > AmbientTheme.MinZoom) || (this.currentState == ZoomState.In && parentView.Zoom < AmbientTheme.MaxZoom));
}
}
private void StoreUIState()
{
IMenuCommandService menuCommandService = GetService(typeof(IMenuCommandService)) as IMenuCommandService;
if (menuCommandService != null)
{
foreach (CommandID affectedCommand in CommandSet.NavigationToolCommandIds)
{
MenuCommand menuCommand = menuCommandService.FindCommand(affectedCommand);
if (menuCommand != null && menuCommand.Enabled && menuCommand.Checked)
{
this.previousCommand = menuCommand.CommandID;
break;
}
}
}
this.previousCursor = ParentView.Cursor;
}
private void RestoreUIState()
{
IMenuCommandService menuCommandService = GetService(typeof(IMenuCommandService)) as IMenuCommandService;
if (menuCommandService != null)
{
foreach (CommandID affectedCommand in CommandSet.NavigationToolCommandIds)
{
MenuCommand menuCommand = menuCommandService.FindCommand(affectedCommand);
if (menuCommand != null && menuCommand.Enabled)
menuCommand.Checked = (menuCommand.CommandID == this.previousCommand);
}
}
ParentView.Cursor = this.previousCursor;
}
private void RefreshUIState()
{
//Update the cursor
WorkflowView parentView = ParentView;
if (!CanContinueZooming)
parentView.Cursor = ZoomingMessageFilter.ZoomDisabledCursor;
else if (this.currentState == ZoomState.In)
parentView.Cursor = ZoomingMessageFilter.ZoomInCursor;
else
parentView.Cursor = ZoomingMessageFilter.ZoomOutCursor;
//Update the fast zoom
if (this.fastZoomingMessageFilter == null && CanContinueZooming && this.currentState == ZoomState.In)
{
this.fastZoomingMessageFilter = new DragRectangleMessageFilter();
this.fastZoomingMessageFilter.DragComplete += new EventHandler(OnZoomRectComplete);
parentView.AddDesignerMessageFilter(this.fastZoomingMessageFilter);
}
else if (this.fastZoomingMessageFilter != null && (!CanContinueZooming || this.currentState != ZoomState.In))
{
this.fastZoomingMessageFilter.DragComplete -= new EventHandler(OnZoomRectComplete);
parentView.RemoveDesignerMessageFilter(this.fastZoomingMessageFilter);
this.fastZoomingMessageFilter = null;
}
//Update the menu
IMenuCommandService menuCommandService = GetService(typeof(IMenuCommandService)) as IMenuCommandService;
if (menuCommandService != null)
{
foreach (CommandID affectedCommand in CommandSet.NavigationToolCommandIds)
{
MenuCommand menuCommand = menuCommandService.FindCommand(affectedCommand);
if (menuCommand != null && menuCommand.Enabled)
menuCommand.Checked = (menuCommand.CommandID == ((this.initialState == ZoomState.In) ? WorkflowMenuCommands.ZoomIn : WorkflowMenuCommands.ZoomOut));
}
}
}
#endregion
}
#endregion
}
// File provided for Reference Use Only by Microsoft Corporation (c) 2007.
// Copyright (c) Microsoft Corporation. All rights reserved.
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