104 lines
2.6 KiB
C#
104 lines
2.6 KiB
C#
using System;
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using System.Runtime.InteropServices;
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using EveOPreview.Services.Interop;
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namespace EveOPreview.Services.Implementation
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{
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class DwmThumbnail : IDwmThumbnail
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{
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#region Private fields
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private readonly IWindowManager _windowManager;
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private IntPtr _handle;
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private DWM_THUMBNAIL_PROPERTIES _properties;
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#endregion
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public DwmThumbnail(IWindowManager windowManager)
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{
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this._windowManager = windowManager;
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this._handle = IntPtr.Zero;
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}
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public void Register(IntPtr destination, IntPtr source)
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{
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this._properties = new DWM_THUMBNAIL_PROPERTIES();
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this._properties.dwFlags = DWM_TNP_CONSTANTS.DWM_TNP_VISIBLE
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+ DWM_TNP_CONSTANTS.DWM_TNP_OPACITY
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+ DWM_TNP_CONSTANTS.DWM_TNP_RECTDESTINATION
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+ DWM_TNP_CONSTANTS.DWM_TNP_SOURCECLIENTAREAONLY;
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this._properties.opacity = 255;
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this._properties.fVisible = true;
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this._properties.fSourceClientAreaOnly = true;
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if (!this._windowManager.IsCompositionEnabled)
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{
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return;
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}
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try
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{
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this._handle = DwmNativeMethods.DwmRegisterThumbnail(destination, source);
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}
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catch (ArgumentException)
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{
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// This exception is raised if the source client is already closed
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// Can happen on a really slow CPU's that the window is still being
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// lised in the process list yet it already cannot be used as
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// a thumbnail source
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this._handle = IntPtr.Zero;
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}
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catch (COMException)
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{
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// This exception is raised if DWM is suddenly not available
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// (f.e. when switching between Windows user accounts)
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this._handle = IntPtr.Zero;
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}
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}
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public void Unregister()
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{
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if ((!this._windowManager.IsCompositionEnabled) || (this._handle == IntPtr.Zero))
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{
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return;
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}
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try
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{
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DwmNativeMethods.DwmUnregisterThumbnail(this._handle);
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}
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catch (ArgumentException)
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{
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}
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catch (COMException)
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{
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// This exception is raised when DWM is not available for some reason
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}
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}
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public void Move(int left, int top, int right, int bottom)
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{
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this._properties.rcDestination = new RECT(left, top, right, bottom);
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}
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public void Update()
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{
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if ((!this._windowManager.IsCompositionEnabled) || (this._handle == IntPtr.Zero))
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{
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return;
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}
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try
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{
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DwmNativeMethods.DwmUpdateThumbnailProperties(this._handle, this._properties);
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}
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catch (ArgumentException)
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{
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// This exception will be thrown if the EVE client disappears while this method is running
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}
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catch (COMException)
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{
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// This exception is raised when DWM is not available for some reason
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}
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}
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}
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}
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