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/*
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Version: MPL 1.1/GPL 2.0/LGPL 2.1
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The contents of this file are subject to the Mozilla Public License Version
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1.1 (the "License"); you may not use this file except in compliance with
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the License. You may obtain a copy of the License at
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http://www.mozilla.org/MPL/
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Software distributed under the License is distributed on an "AS IS" basis,
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WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
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for the specific language governing rights and limitations under the License.
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The Original Code is the Open Hardware Monitor code.
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The Initial Developer of the Original Code is
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Michael Möller <m.moeller@gmx.ch>.
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Portions created by the Initial Developer are Copyright (C) 2010
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the Initial Developer. All Rights Reserved.
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Contributor(s):
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Alternatively, the contents of this file may be used under the terms of
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either the GNU General Public License Version 2 or later (the "GPL"), or
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the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
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in which case the provisions of the GPL or the LGPL are applicable instead
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of those above. If you wish to allow use of your version of this file only
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under the terms of either the GPL or the LGPL, and not to allow others to
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use your version of this file under the terms of the MPL, indicate your
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decision by deleting the provisions above and replace them with the notice
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and other provisions required by the GPL or the LGPL. If you do not delete
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the provisions above, a recipient may use your version of this file under
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the terms of any one of the MPL, the GPL or the LGPL.
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*/
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using System;
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using System.Drawing;
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using System.Reflection;
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using System.Runtime.InteropServices;
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using System.Windows.Forms;
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namespace OpenHardwareMonitor.GUI {
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public class GadgetWindow : NativeWindow {
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private bool visible = false;
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private bool lockPosition = false;
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private bool alwaysOnTop = false;
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private byte opacity = 255;
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private Point location = new Point(100, 100);
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private Size size = new Size(130, 84);
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private ContextMenu contextMenu = null;
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private MethodInfo commandDispatch;
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public GadgetWindow() {
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Type commandType =
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typeof(Form).Assembly.GetType("System.Windows.Forms.Command");
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commandDispatch = commandType.GetMethod("DispatchID",
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BindingFlags.Static | BindingFlags.NonPublic | BindingFlags.Public,
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null, new Type[]{ typeof(int) }, null);
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this.CreateHandle(CreateParams);
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// move window to the bottom
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MoveToBottom(Handle);
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// prevent window from fading to a glass sheet when peek is invoked
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try {
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bool value = true;
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int r = NativeMethods.DwmSetWindowAttribute(Handle,
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WindowAttribute.DWMWA_EXCLUDED_FROM_PEEK, ref value,
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Marshal.SizeOf(value));
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} catch (DllNotFoundException) { } catch (EntryPointNotFoundException) { }
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}
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private void ShowDesktopChanged(bool showDesktop) {
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if (showDesktop) {
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MoveToTopMost(Handle);
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} else {
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MoveToBottom(Handle);
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}
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}
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private void MoveToBottom(IntPtr handle) {
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NativeMethods.SetWindowPos(handle, HWND_BOTTOM, 0, 0, 0, 0,
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SWP_NOMOVE | SWP_NOSIZE | SWP_NOACTIVATE | SWP_NOSENDCHANGING);
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}
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private void MoveToTopMost(IntPtr handle) {
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NativeMethods.SetWindowPos(handle, HWND_TOPMOST, 0, 0, 0, 0,
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SWP_NOMOVE | SWP_NOSIZE | SWP_NOACTIVATE | SWP_NOSENDCHANGING);
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}
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private void ShowContextMenu(Point position) {
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NativeMethods.TrackPopupMenuEx(contextMenu.Handle,
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TPM_RIGHTBUTTON | TPM_VERTICAL, position.X,
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position.Y, Handle, IntPtr.Zero);
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}
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protected virtual CreateParams CreateParams {
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get {
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CreateParams cp = new CreateParams();
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cp.Width = size.Width;
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cp.Height = size.Height;
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cp.X = location.X;
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cp.Y = location.Y;
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cp.ExStyle = WS_EX_LAYERED | WS_EX_TOOLWINDOW;
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return cp;
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}
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}
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protected override void WndProc(ref Message message) {
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switch (message.Msg) {
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case WM_COMMAND:
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// need to dispatch the message for the context menu
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if (message.LParam == IntPtr.Zero)
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commandDispatch.Invoke(null, new object[] {
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message.WParam.ToInt32() & 0xFFFF });
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break;
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case WM_NCHITTEST:
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// all pixels of the form belong to the caption
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message.Result = HTCAPTION;
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break;
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case WM_NCLBUTTONDBLCLK:
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message.Result = IntPtr.Zero; break;
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case WM_NCRBUTTONDOWN:
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message.Result = IntPtr.Zero; break;
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case WM_NCRBUTTONUP:
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if (contextMenu != null)
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ShowContextMenu(new Point(
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(int)((uint)message.LParam & 0xFFFF),
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(int)(((uint)message.LParam >>16) & 0xFFFF)));
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message.Result = IntPtr.Zero;
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break;
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case WM_WINDOWPOSCHANGING:
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WindowPos wp = (WindowPos)Marshal.PtrToStructure(
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message.LParam, typeof(WindowPos));
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// add the nomove flag if position is locked
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if (lockPosition)
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wp.flags |= SWP_NOMOVE;
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// prevent the window from leaving the screen
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if ((wp.flags & SWP_NOMOVE) == 0) {
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Rectangle rect = Screen.GetWorkingArea(new Point(wp.x, wp.y));
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const int margin = 20;
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wp.x = Math.Max(wp.x, rect.Left - wp.cx + margin);
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wp.x = Math.Min(wp.x, rect.Right - margin);
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wp.y = Math.Max(wp.y, rect.Top - wp.cy + margin);
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wp.y = Math.Min(wp.y, rect.Bottom - margin);
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// raise the event if location changed
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if (location.X != wp.x || location.Y != wp.y) {
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location = new Point(wp.x, wp.y);
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if (LocationChanged != null)
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LocationChanged(this, EventArgs.Empty);
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}
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}
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Marshal.StructureToPtr(wp, message.LParam, false);
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message.Result = IntPtr.Zero;
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break;
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default:
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base.WndProc(ref message); break;
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}
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}
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private BlendFunction CreateBlendFunction() {
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BlendFunction blend = new BlendFunction();
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blend.BlendOp = AC_SRC_OVER;
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blend.BlendFlags = 0;
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blend.SourceConstantAlpha = opacity;
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blend.AlphaFormat = AC_SRC_ALPHA;
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return blend;
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}
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public void Update(Bitmap bitmap) {
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IntPtr screen = NativeMethods.GetDC(IntPtr.Zero);
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IntPtr memory = NativeMethods.CreateCompatibleDC(screen);
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IntPtr newHBitmap = IntPtr.Zero;
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IntPtr oldHBitmap = IntPtr.Zero;
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try {
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newHBitmap = bitmap.GetHbitmap(Color.Black);
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oldHBitmap = NativeMethods.SelectObject(memory, newHBitmap);
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Size size = bitmap.Size;
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Point pointSource = Point.Empty;
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Point topPos = Location;
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BlendFunction blend = CreateBlendFunction();
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NativeMethods.UpdateLayeredWindow(Handle, screen, ref topPos,
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ref size, memory, ref pointSource, 0, ref blend, ULW_ALPHA);
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} finally {
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NativeMethods.ReleaseDC(IntPtr.Zero, screen);
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if (newHBitmap != IntPtr.Zero) {
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NativeMethods.SelectObject(memory, oldHBitmap);
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NativeMethods.DeleteObject(newHBitmap);
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}
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NativeMethods.DeleteDC(memory);
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}
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}
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public byte Opacity {
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get {
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return opacity;
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}
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set {
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if (opacity != value) {
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opacity = value;
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BlendFunction blend = CreateBlendFunction();
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NativeMethods.UpdateLayeredWindow(Handle, IntPtr.Zero, IntPtr.Zero,
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IntPtr.Zero, IntPtr.Zero, IntPtr.Zero, 0, ref blend, ULW_ALPHA);
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}
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}
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}
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public bool Visible {
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get {
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return visible;
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}
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set {
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if (visible != value) {
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visible = value;
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NativeMethods.SetWindowPos(Handle, IntPtr.Zero, 0, 0, 0, 0,
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SWP_NOMOVE | SWP_NOSIZE | SWP_NOACTIVATE | SWP_NOZORDER |
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(value ? SWP_SHOWWINDOW : SWP_HIDEWINDOW));
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if (value)
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ShowDesktop.Instance.ShowDesktopChanged += ShowDesktopChanged;
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else
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ShowDesktop.Instance.ShowDesktopChanged -= ShowDesktopChanged;
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}
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}
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}
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// if locked, the window can not be moved
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public bool LockPosition {
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get {
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return lockPosition;
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}
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set {
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lockPosition = value;
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}
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}
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public bool AlwaysOnTop {
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get {
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return alwaysOnTop;
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}
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set {
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moel@176
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if (value != alwaysOnTop) {
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alwaysOnTop = value;
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moel@176
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if (alwaysOnTop) {
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ShowDesktop.Instance.ShowDesktopChanged -= ShowDesktopChanged;
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MoveToTopMost(Handle);
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} else {
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MoveToBottom(Handle);
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ShowDesktop.Instance.ShowDesktopChanged += ShowDesktopChanged;
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}
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moel@176
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}
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moel@176
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}
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moel@176
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}
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moel@176
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public Size Size {
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moel@176
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get {
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moel@176
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return size;
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moel@176
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}
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moel@176
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set {
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moel@176
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if (size != value) {
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moel@176
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size = value;
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moel@176
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NativeMethods.SetWindowPos(Handle, IntPtr.Zero, 0, 0, size.Width,
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size.Height, SWP_NOMOVE | SWP_NOACTIVATE | SWP_NOZORDER |
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SWP_NOSENDCHANGING);
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moel@176
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}
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moel@176
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}
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moel@176
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}
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public Point Location {
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moel@176
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get {
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moel@176
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return location;
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moel@176
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}
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moel@176
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set {
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moel@176
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NativeMethods.SetWindowPos(Handle, IntPtr.Zero, value.X, value.Y, 0,
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moel@176
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0, SWP_NOSIZE | SWP_NOACTIVATE | SWP_NOZORDER | SWP_NOSENDCHANGING);
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moel@176
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location = value;
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moel@176
|
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if (LocationChanged != null)
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moel@176
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LocationChanged(this, EventArgs.Empty);
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moel@176
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}
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moel@176
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}
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moel@176
|
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moel@176
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public event EventHandler LocationChanged;
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moel@176
|
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moel@176
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public ContextMenu ContextMenu {
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moel@176
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get {
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moel@176
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return contextMenu;
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moel@176
|
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}
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moel@176
|
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set {
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moel@176
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this.contextMenu = value;
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moel@176
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}
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moel@176
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}
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moel@176
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moel@176
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[StructLayout(LayoutKind.Sequential, Pack = 1)]
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moel@176
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private struct BlendFunction {
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moel@176
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public byte BlendOp;
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moel@176
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public byte BlendFlags;
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moel@176
|
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public byte SourceConstantAlpha;
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moel@176
|
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public byte AlphaFormat;
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moel@176
|
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}
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moel@176
|
310 |
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moel@176
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311 |
[StructLayout(LayoutKind.Sequential, Pack = 1)]
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moel@176
|
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private struct WindowPos {
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moel@176
|
313 |
public IntPtr hwnd;
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moel@176
|
314 |
public IntPtr hwndInsertAfter;
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moel@176
|
315 |
public int x;
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moel@176
|
316 |
public int y;
|
moel@176
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317 |
public int cx;
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moel@176
|
318 |
public int cy;
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moel@176
|
319 |
public uint flags;
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moel@176
|
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}
|
moel@176
|
321 |
|
moel@176
|
322 |
public static readonly IntPtr HWND_BOTTOM = (IntPtr)1;
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moel@176
|
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public static readonly IntPtr HWND_TOPMOST = (IntPtr)(-1);
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moel@176
|
324 |
|
moel@176
|
325 |
public const int WS_EX_LAYERED = 0x00080000;
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moel@176
|
326 |
public const int WS_EX_TOOLWINDOW = 0x00000080;
|
moel@176
|
327 |
|
moel@176
|
328 |
public const uint SWP_NOSIZE = 0x0001;
|
moel@176
|
329 |
public const uint SWP_NOMOVE = 0x0002;
|
moel@176
|
330 |
public const uint SWP_NOACTIVATE = 0x0010;
|
moel@176
|
331 |
public const uint SWP_HIDEWINDOW = 0x0080;
|
moel@176
|
332 |
public const uint SWP_SHOWWINDOW = 0x0040;
|
moel@176
|
333 |
public const uint SWP_NOZORDER = 0x0004;
|
moel@176
|
334 |
public const uint SWP_NOSENDCHANGING = 0x0400;
|
moel@176
|
335 |
|
moel@176
|
336 |
public const int ULW_COLORKEY = 0x00000001;
|
moel@176
|
337 |
public const int ULW_ALPHA = 0x00000002;
|
moel@176
|
338 |
public const int ULW_OPAQUE = 0x00000004;
|
moel@176
|
339 |
|
moel@176
|
340 |
public const byte AC_SRC_OVER = 0x00;
|
moel@176
|
341 |
public const byte AC_SRC_ALPHA = 0x01;
|
moel@176
|
342 |
|
moel@176
|
343 |
public const int WM_NCHITTEST = 0x0084;
|
moel@176
|
344 |
public const int WM_NCLBUTTONDBLCLK = 0x00A3;
|
moel@176
|
345 |
public const int WM_NCLBUTTONDOWN = 0x00A1;
|
moel@176
|
346 |
public const int WM_NCLBUTTONUP = 0x00A2;
|
moel@176
|
347 |
public const int WM_NCRBUTTONDOWN = 0x00A4;
|
moel@176
|
348 |
public const int WM_NCRBUTTONUP = 0x00A5;
|
moel@176
|
349 |
public const int WM_WINDOWPOSCHANGING = 0x0046;
|
moel@176
|
350 |
public const int WM_COMMAND = 0x0111;
|
moel@176
|
351 |
|
moel@176
|
352 |
public const int TPM_RIGHTBUTTON = 0x0002;
|
moel@176
|
353 |
public const int TPM_VERTICAL = 0x0040;
|
moel@176
|
354 |
|
moel@176
|
355 |
public readonly IntPtr HTCAPTION = (IntPtr)2;
|
moel@176
|
356 |
|
moel@176
|
357 |
private enum WindowAttribute : int {
|
moel@176
|
358 |
DWMWA_NCRENDERING_ENABLED = 1,
|
moel@176
|
359 |
DWMWA_NCRENDERING_POLICY,
|
moel@176
|
360 |
DWMWA_TRANSITIONS_FORCEDISABLED,
|
moel@176
|
361 |
DWMWA_ALLOW_NCPAINT,
|
moel@176
|
362 |
DWMWA_CAPTION_BUTTON_BOUNDS,
|
moel@176
|
363 |
DWMWA_NONCLIENT_RTL_LAYOUT,
|
moel@176
|
364 |
DWMWA_FORCE_ICONIC_REPRESENTATION,
|
moel@176
|
365 |
DWMWA_FLIP3D_POLICY,
|
moel@176
|
366 |
DWMWA_EXTENDED_FRAME_BOUNDS,
|
moel@176
|
367 |
DWMWA_HAS_ICONIC_BITMAP,
|
moel@176
|
368 |
DWMWA_DISALLOW_PEEK,
|
moel@176
|
369 |
DWMWA_EXCLUDED_FROM_PEEK,
|
moel@176
|
370 |
DWMWA_LAST
|
moel@176
|
371 |
}
|
moel@176
|
372 |
|
moel@176
|
373 |
private static class NativeMethods {
|
moel@176
|
374 |
private const string USER = "user32.dll";
|
moel@176
|
375 |
private const string GDI = "gdi32.dll";
|
moel@176
|
376 |
public const string DWMAPI = "dwmapi.dll";
|
moel@176
|
377 |
|
moel@176
|
378 |
[DllImport(USER, CallingConvention = CallingConvention.Winapi)]
|
moel@176
|
379 |
[return: MarshalAs(UnmanagedType.Bool)]
|
moel@176
|
380 |
public static extern bool UpdateLayeredWindow(IntPtr hwnd, IntPtr hdcDst,
|
moel@176
|
381 |
ref Point pptDst, ref Size psize, IntPtr hdcSrc, ref Point pprSrc,
|
moel@176
|
382 |
int crKey, ref BlendFunction pblend, int dwFlags);
|
moel@176
|
383 |
|
moel@176
|
384 |
[DllImport(USER, CallingConvention = CallingConvention.Winapi)]
|
moel@176
|
385 |
[return: MarshalAs(UnmanagedType.Bool)]
|
moel@176
|
386 |
public static extern bool UpdateLayeredWindow(IntPtr hwnd, IntPtr hdcDst,
|
moel@176
|
387 |
IntPtr pptDst, IntPtr psize, IntPtr hdcSrc, IntPtr pprSrc,
|
moel@176
|
388 |
int crKey, ref BlendFunction pblend, int dwFlags);
|
moel@176
|
389 |
|
moel@176
|
390 |
[DllImport(USER, CallingConvention = CallingConvention.Winapi)]
|
moel@176
|
391 |
public static extern IntPtr GetDC(IntPtr hWnd);
|
moel@176
|
392 |
|
moel@176
|
393 |
[DllImport(USER, CallingConvention = CallingConvention.Winapi)]
|
moel@176
|
394 |
public static extern int ReleaseDC(IntPtr hWnd, IntPtr hDC);
|
moel@176
|
395 |
|
moel@176
|
396 |
[DllImport(USER, CallingConvention = CallingConvention.Winapi)]
|
moel@176
|
397 |
public static extern bool SetWindowPos(IntPtr hWnd,
|
moel@176
|
398 |
IntPtr hWndInsertAfter, int X, int Y, int cx, int cy, uint uFlags);
|
moel@176
|
399 |
|
moel@176
|
400 |
[DllImport(USER, CallingConvention = CallingConvention.Winapi)]
|
moel@176
|
401 |
public static extern bool TrackPopupMenuEx(IntPtr hMenu, uint uFlags,
|
moel@176
|
402 |
int x, int y, IntPtr hWnd, IntPtr tpmParams);
|
moel@176
|
403 |
|
moel@176
|
404 |
[DllImport(GDI, CallingConvention = CallingConvention.Winapi)]
|
moel@176
|
405 |
public static extern IntPtr CreateCompatibleDC(IntPtr hDC);
|
moel@176
|
406 |
|
moel@176
|
407 |
[DllImport(GDI, CallingConvention = CallingConvention.Winapi)]
|
moel@176
|
408 |
[return: MarshalAs(UnmanagedType.Bool)]
|
moel@176
|
409 |
public static extern bool DeleteDC(IntPtr hdc);
|
moel@176
|
410 |
|
moel@176
|
411 |
[DllImport(GDI, CallingConvention = CallingConvention.Winapi)]
|
moel@176
|
412 |
public static extern IntPtr SelectObject(IntPtr hDC, IntPtr hObject);
|
moel@176
|
413 |
|
moel@176
|
414 |
[DllImport(GDI, CallingConvention = CallingConvention.Winapi)]
|
moel@176
|
415 |
[return: MarshalAs(UnmanagedType.Bool)]
|
moel@176
|
416 |
public static extern bool DeleteObject(IntPtr hObject);
|
moel@176
|
417 |
|
moel@176
|
418 |
[DllImport(DWMAPI, CallingConvention = CallingConvention.Winapi)]
|
moel@176
|
419 |
public static extern int DwmSetWindowAttribute(IntPtr hwnd,
|
moel@176
|
420 |
WindowAttribute dwAttribute, ref bool pvAttribute, int cbAttribute);
|
moel@176
|
421 |
}
|
moel@176
|
422 |
}
|
moel@176
|
423 |
}
|