Code:
/ DotNET / DotNET / 8.0 / untmp / whidbey / REDBITS / ndp / fx / src / WinForms / Managed / System / WinForms / ToolStripScrollButton.cs / 1 / ToolStripScrollButton.cs
//------------------------------------------------------------------------------ //// Copyright (c) Microsoft Corporation. All rights reserved. // //----------------------------------------------------------------------------- namespace System.Windows.Forms { using System; using System.ComponentModel; using System.Drawing; using System.Drawing.Design; using System.Diagnostics; using System.Windows.Forms.ButtonInternal; using System.Security.Permissions; using System.Security; ////// /// A non selectable winbar item /// internal class ToolStripScrollButton : ToolStripControlHost { private bool up = true; [ThreadStatic] private static Bitmap upScrollImage; [ThreadStatic] private static Bitmap downScrollImage; const int AUTOSCROLL_UPDATE = 50; private static readonly int AUTOSCROLL_PAUSE = SystemInformation.DoubleClickTime; private Timer mouseDownTimer; public ToolStripScrollButton(bool up) : base(CreateControlInstance(up)) { this.up = up; } private static Control CreateControlInstance(bool up) { StickyLabel label = new StickyLabel(); label.ImageAlign = ContentAlignment.MiddleCenter; label.Image = (up) ? UpImage : DownImage; return label; } ////// Deriving classes can override this to configure a default size for their control. /// This is more efficient than setting the size in the control's constructor. /// protected internal override Padding DefaultMargin { get { return Padding.Empty; } } protected override Padding DefaultPadding { get { return Padding.Empty; } } private static Image DownImage { get { if (downScrollImage == null) { downScrollImage = new Bitmap(typeof(ToolStripScrollButton), "ScrollButtonDown.bmp"); downScrollImage.MakeTransparent(Color.White); } return downScrollImage; } } internal StickyLabel Label { get{ return Control as StickyLabel; } } private static Image UpImage { get { if (upScrollImage == null) { upScrollImage = new Bitmap(typeof(ToolStripScrollButton), "ScrollButtonUp.bmp"); upScrollImage.MakeTransparent(Color.White); } return upScrollImage; } } private Timer MouseDownTimer { get{ if (mouseDownTimer == null) { mouseDownTimer = new Timer(); } return mouseDownTimer; } } protected override void Dispose(bool disposing) { if (disposing) { if (mouseDownTimer != null) { mouseDownTimer.Enabled = false; mouseDownTimer.Dispose(); mouseDownTimer = null; } } base.Dispose(disposing); } protected override void OnMouseDown (MouseEventArgs e) { UnsubscribeAll(); base.OnMouseDown(e); Scroll(); MouseDownTimer.Interval = AUTOSCROLL_PAUSE; MouseDownTimer.Tick += new EventHandler(OnInitialAutoScrollMouseDown); MouseDownTimer.Enabled = true; } protected override void OnMouseUp (MouseEventArgs e) { UnsubscribeAll(); base.OnMouseUp(e); } protected override void OnMouseLeave (EventArgs e) { UnsubscribeAll(); } private void UnsubscribeAll() { MouseDownTimer.Enabled = false; MouseDownTimer.Tick -= new EventHandler(OnInitialAutoScrollMouseDown); MouseDownTimer.Tick -= new EventHandler(OnAutoScrollAccellerate); } private void OnAutoScrollAccellerate(object sender, EventArgs e) { Scroll(); } private void OnInitialAutoScrollMouseDown(object sender, EventArgs e) { MouseDownTimer.Tick -= new EventHandler(OnInitialAutoScrollMouseDown); Scroll(); MouseDownTimer.Interval = AUTOSCROLL_UPDATE; MouseDownTimer.Tick += new EventHandler(OnAutoScrollAccellerate); } public override Size GetPreferredSize(Size constrainingSize) { Size preferredSize = Size.Empty; preferredSize.Height = (Label.Image != null) ? Label.Image.Height + 4 : 0; preferredSize.Width = (ParentInternal != null) ? ParentInternal.Width - 2 : preferredSize.Width; // Two for border return preferredSize; } private void Scroll() { ToolStripDropDownMenu parent = this.ParentInternal as ToolStripDropDownMenu; if (parent != null && Label.Enabled) { parent.ScrollInternal(up); } } internal class StickyLabel : Label { public StickyLabel() { } private bool freezeLocationChange = false; public bool FreezeLocationChange { get { return freezeLocationChange; } } protected override void SetBoundsCore(int x,int y,int width, int height, BoundsSpecified specified) { if (((specified & BoundsSpecified.Location) != 0) && FreezeLocationChange) { return; } base.SetBoundsCore(x, y, width, height, specified); } [SecurityPermission(SecurityAction.LinkDemand, Flags=SecurityPermissionFlag.UnmanagedCode)] protected override void WndProc(ref Message m) { if (m.Msg >= NativeMethods.WM_KEYFIRST && m.Msg <= NativeMethods.WM_KEYLAST) { // SECREVIEW: // NOTE this is the same as ToolStripDropDown, except we NEVER want to raise the key events. DefWndProc(ref m); return; } base.WndProc(ref m); } } } } // File provided for Reference Use Only by Microsoft Corporation (c) 2007. // Copyright (c) Microsoft Corporation. All rights reserved.
Link Menu

This book is available now!
Buy at Amazon US or
Buy at Amazon UK
- XmlDocumentType.cs
- EventRouteFactory.cs
- CultureInfoConverter.cs
- JsonDeserializer.cs
- ClientCultureInfo.cs
- compensatingcollection.cs
- AsymmetricSignatureFormatter.cs
- DataGridViewCellStyleConverter.cs
- BamlRecordHelper.cs
- NextPreviousPagerField.cs
- contentDescriptor.cs
- DesignTimeVisibleAttribute.cs
- ItemDragEvent.cs
- ViewEvent.cs
- SQLString.cs
- SecurityKeyUsage.cs
- SupportsEventValidationAttribute.cs
- SqlGenerator.cs
- RequestCachePolicyConverter.cs
- DbProviderFactory.cs
- NativeWindow.cs
- Utils.cs
- AVElementHelper.cs
- ArgumentNullException.cs
- DllNotFoundException.cs
- Brush.cs
- PropertyPath.cs
- StatusBarDrawItemEvent.cs
- CodeCommentStatementCollection.cs
- StylusPointProperty.cs
- StagingAreaInputItem.cs
- ProcessHost.cs
- AdapterUtil.cs
- PrincipalPermission.cs
- MarkupCompiler.cs
- EventToken.cs
- UnsafeNativeMethodsCLR.cs
- EntitySet.cs
- GridViewCommandEventArgs.cs
- Size3D.cs
- EventToken.cs
- Cursor.cs
- ProjectionPruner.cs
- LayoutTable.cs
- Stroke2.cs
- COM2ExtendedBrowsingHandler.cs
- RemotingConfiguration.cs
- SqlVisitor.cs
- Animatable.cs
- XmlSchemaSimpleTypeUnion.cs
- EndOfStreamException.cs
- RowType.cs
- FieldBuilder.cs
- ThemeInfoAttribute.cs
- ThreadAbortException.cs
- ResourcesGenerator.cs
- AppDomainShutdownMonitor.cs
- Helper.cs
- ILGen.cs
- PageWrapper.cs
- DesignerAttribute.cs
- PeerCollaborationPermission.cs
- Registry.cs
- SynchronizedInputPattern.cs
- WebPartsSection.cs
- ExpressionNode.cs
- XmlSchemaExporter.cs
- ContainerParagraph.cs
- CompilerScopeManager.cs
- ArgumentOutOfRangeException.cs
- ToolStripRenderEventArgs.cs
- VisualStyleTypesAndProperties.cs
- DrawToolTipEventArgs.cs
- WebPartRestoreVerb.cs
- WorkflowOwnerAsyncResult.cs
- DiscriminatorMap.cs
- Opcode.cs
- FileAuthorizationModule.cs
- FixedSOMLineCollection.cs
- XmlNotation.cs
- StatusBarItem.cs
- SqlBulkCopy.cs
- XamlBrushSerializer.cs
- DelegateSerializationHolder.cs
- TileBrush.cs
- ReflectionHelper.cs
- IndentTextWriter.cs
- MetadataCacheItem.cs
- DataGridRowHeader.cs
- WebServiceBindingAttribute.cs
- ExpandCollapseProviderWrapper.cs
- DataGridViewButtonColumn.cs
- COM2Enum.cs
- PrintEvent.cs
- WebRequestModuleElementCollection.cs
- MessageQueueKey.cs
- BamlCollectionHolder.cs
- securitycriticaldataClass.cs
- DataGridViewTextBoxCell.cs
- ProfilePropertyMetadata.cs