DotNet 4.8.1 build of DotNetBar
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282
PROMS/DotNetBar Source Code/BubbleBarOverlay.cs
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282
PROMS/DotNetBar Source Code/BubbleBarOverlay.cs
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using System;
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using System.Drawing;
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using System.Drawing.Imaging;
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using System.Drawing.Text;
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using System.Windows.Forms;
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using System.ComponentModel;
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namespace DevComponents.DotNetBar
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{
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/// <summary>
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/// Represents overlay class to support bubble effects on BubbleBar control.
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/// </summary>
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[ToolboxItem(false)]
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internal class BubbleBarOverlay:Control
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{
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#region Private Variables
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private BubbleBar m_BubbleBar=null;
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private Timer m_VisibilityTimer=null;
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#endregion
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#region Internal Implementation
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public BubbleBarOverlay(BubbleBar parent)
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{
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if(parent==null)
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throw new InvalidOperationException("Parent BubbleBar object for BubbleBarOverlay cannot be null.");
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m_BubbleBar=parent;
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this.SetStyle(ControlStyles.UserPaint,true);
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this.SetStyle(ControlStyles.AllPaintingInWmPaint,true);
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this.SetStyle(ControlStyles.Opaque,true);
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this.SetStyle(ControlStyles.ResizeRedraw,true);
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//this.SetStyle(DisplayHelp.DoubleBufferFlag,true);
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this.SetStyle(ControlStyles.SupportsTransparentBackColor,true);
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this.SetStyle(ControlStyles.ContainerControl,false);
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this.SetStyle(ControlStyles.Selectable,false);
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this.BackColor=Color.Transparent;
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}
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protected override void OnPaint(PaintEventArgs e){}
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internal void UpdateWindow()
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{
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// Create bitmap for drawing onto
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Bitmap memoryBitmap = new Bitmap(this.Width, this.Height, PixelFormat.Format32bppArgb);
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using(Graphics g = Graphics.FromImage(memoryBitmap))
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{
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// Draw the background area
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g.Clear(Color.Transparent);
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g.CompositingMode=System.Drawing.Drawing2D.CompositingMode.SourceCopy;
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g.TextRenderingHint = DisplayHelp.AntiAliasTextRenderingHint;
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g.SmoothingMode=System.Drawing.Drawing2D.SmoothingMode.AntiAlias;
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PaintEventArgs p=new PaintEventArgs(g,this.DisplayRectangle);
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m_BubbleBar.OnPaintOverlay(p);
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// Get hold of the screen DC
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IntPtr hDC = NativeFunctions.GetDC(IntPtr.Zero);
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// Create a memory based DC compatible with the screen DC
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IntPtr memoryDC = WinApi.CreateCompatibleDC(hDC);
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// Get access to the bitmap handle contained in the Bitmap object
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IntPtr hBitmap = memoryBitmap.GetHbitmap(Color.FromArgb(0));
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// Select this bitmap for updating the window presentation
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IntPtr oldBitmap = WinApi.SelectObject(memoryDC, hBitmap);
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// New window size
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NativeFunctions.SIZE ulwsize;
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ulwsize.cx = this.Width;
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ulwsize.cy = this.Height;
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// New window position
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NativeFunctions.POINT topPos;
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topPos.x = this.Left;
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topPos.y = this.Top;
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// Offset into memory bitmap is always zero
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NativeFunctions.POINT pointSource;
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pointSource.x = 0;
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pointSource.y = 0;
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// We want to make the entire bitmap opaque
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NativeFunctions.BLENDFUNCTION blend = new NativeFunctions.BLENDFUNCTION();
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blend.BlendOp = (byte)NativeFunctions.Win23AlphaFlags.AC_SRC_OVER;
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blend.BlendFlags = 0;
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blend.SourceConstantAlpha = 255;
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blend.AlphaFormat = (byte)NativeFunctions.Win23AlphaFlags.AC_SRC_ALPHA;
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// Tell operating system to use our bitmap for painting
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NativeFunctions.UpdateLayeredWindow(this.Handle, hDC, ref topPos, ref ulwsize,
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memoryDC, ref pointSource, 0, ref blend,
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(int)NativeFunctions.Win32UpdateLayeredWindowsFlags.ULW_ALPHA);
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// Put back the old bitmap handle
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WinApi.SelectObject(memoryDC, oldBitmap);
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// Cleanup resources
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WinApi.ReleaseDC(IntPtr.Zero, hDC);
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WinApi.DeleteObject(hBitmap);
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WinApi.DeleteDC(memoryDC);
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}
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}
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protected override void OnMouseEnter(EventArgs e)
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{
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this.Capture=true;
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base.OnMouseEnter (e);
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}
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protected override void OnMouseMove(MouseEventArgs e)
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{
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if(!this.DisplayRectangle.Contains(e.X,e.Y))
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this.Capture=false;
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m_BubbleBar.MouseMoveMessage(e);
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base.OnMouseMove (e);
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}
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protected override void OnMouseLeave(EventArgs e)
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{
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m_BubbleBar.MouseLeaveMessage(e);
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base.OnMouseLeave(e);
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}
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protected override void OnMouseDown(MouseEventArgs e)
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{
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m_BubbleBar.OverlayMouseDownMessage(e);
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base.OnMouseDown (e);
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}
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protected override void OnMouseUp(MouseEventArgs e)
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{
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m_BubbleBar.OverlayMouseUpMessage(e);
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base.OnMouseUp(e);
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}
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protected override void WndProc(ref Message m)
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{
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const int WM_MOUSEACTIVATE = 0x21;
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const int MA_NOACTIVATE = 3;
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if(m.Msg==WM_MOUSEACTIVATE)
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{
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m.Result=new System.IntPtr(MA_NOACTIVATE);
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return;
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}
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base.WndProc(ref m);
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}
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protected override CreateParams CreateParams
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{
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get
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{
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const uint WS_POPUP=0x80000000;
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const uint WS_CLIPSIBLINGS=0x04000000;
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const uint WS_CLIPCHILDREN=0x02000000;
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const int WS_EX_LAYERED=0x00080000;
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const int WS_EX_TOOLWINDOW=0x00000080;
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CreateParams p=base.CreateParams;
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p.ExStyle=(p.ExStyle | WS_EX_LAYERED | WS_EX_TOOLWINDOW);
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p.Style=unchecked((int)(WS_POPUP | WS_CLIPSIBLINGS | WS_CLIPCHILDREN));
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p.Caption="";
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return p;
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}
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}
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private void CreateTimer()
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{
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if(m_VisibilityTimer!=null)
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return;
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m_VisibilityTimer=new Timer();
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m_VisibilityTimer.Tick+=new EventHandler(this.CheckVisibility);
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m_VisibilityTimer.Interval=500;
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m_VisibilityTimer.Enabled=true;
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m_VisibilityTimer.Start();
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}
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private void DestroyTimer()
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{
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if(m_VisibilityTimer==null)
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return;
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m_VisibilityTimer.Stop();
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m_VisibilityTimer.Enabled=false;
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m_VisibilityTimer.Dispose();
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m_VisibilityTimer=null;
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}
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private void CheckVisibility(object sender,EventArgs e)
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{
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try
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{
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BubbleBar bar = m_BubbleBar;
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if (bar == null || bar.IsDisposed)
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{
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DestroyTimer();
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return;
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}
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Form form = bar.FindForm();
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IntPtr foregroundWindow = NativeFunctions.GetForegroundWindow();
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Control c = null;
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if (foregroundWindow != IntPtr.Zero)
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c = Control.FromHandle(foregroundWindow);
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if (c == null)
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{
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OnOverlayInactive();
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return;
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}
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if (form != null)
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{
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if (Form.ActiveForm == form)
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return;
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Form parentForm = form;
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while (parentForm.ParentForm != null)
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{
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if (parentForm.ParentForm == Form.ActiveForm)
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return;
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parentForm = parentForm.ParentForm;
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}
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if (form.IsMdiChild && form.MdiParent != null)
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{
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if (form.MdiParent.ActiveMdiChild == form)
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return;
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}
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}
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NativeFunctions.POINT p = new NativeFunctions.POINT();
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Point pm = Control.MousePosition;
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p.x = pm.X;
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p.x = pm.Y;
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IntPtr window = IntPtr.Zero;
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if (bar.Parent != null)
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NativeFunctions.ChildWindowFromPoint(bar.Parent.Handle, p);
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if (window == IntPtr.Zero)
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{
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window = NativeFunctions.WindowFromPoint(p);
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}
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if (window != IntPtr.Zero && window != this.Handle && window != bar.Handle && bar.Parent != null && bar.Parent.Handle != window)
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{
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OnOverlayInactive();
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}
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else
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{
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Point pc = this.PointToClient(pm);
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if (!this.DisplayRectangle.Contains(pc))
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{
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bar.MouseLeaveMessage(e);
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}
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}
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}
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catch (NullReferenceException)
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{
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DestroyTimer();
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}
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}
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private void OnOverlayInactive()
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{
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this.Capture=false;
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DestroyTimer();
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m_BubbleBar.OverlayInactive();
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}
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/// <summary>
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/// Called just before window is shown.
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/// </summary>
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internal void BeforeShow()
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{
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CreateTimer();
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}
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/// <summary>
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/// Called after window is closed.
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/// </summary>
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internal void AfterClose()
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{
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DestroyTimer();
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}
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#endregion
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}
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}
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