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Setting WS_CHILD on preview handler (#3048)

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chrisgch 2020-06-12 00:32:35 +02:00 committed by GitHub
parent 071ea1dc97
commit ccfc4d68f3
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1 changed files with 19 additions and 0 deletions
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src/modules/previewpane/common/controls/FormHandlerControl.cs
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@ -14,6 +14,12 @@ namespace Common
/// </summary> /// </summary>
public abstract class FormHandlerControl : Form, IPreviewHandlerControl public abstract class FormHandlerControl : Form, IPreviewHandlerControl
{ {
/// <summary>
/// Needed to make the form a child window.
/// </summary>
private static int gwlStyle = -16;
private static int wsChild = 0x40000000;
/// <summary> /// <summary>
/// Holds the parent window handle. /// Holds the parent window handle.
/// </summary> /// </summary>
@ -150,6 +156,12 @@ namespace Common
[DllImport("user32.dll", CharSet = CharSet.Auto)] [DllImport("user32.dll", CharSet = CharSet.Auto)]
private static extern IntPtr GetFocus(); private static extern IntPtr GetFocus();
[DllImport("user32.dll", SetLastError = true)]
private static extern int GetWindowLong(IntPtr hWnd, int nIndex);
[DllImport("user32.dll", SetLastError = true)]
private static extern int SetWindowLong(IntPtr hWnd, int nIndex, int dwNewLong);
/// <summary> /// <summary>
/// Update the Form Control window with the passed rectangle. /// Update the Form Control window with the passed rectangle.
/// </summary> /// </summary>
@ -158,6 +170,13 @@ namespace Common
{ {
this.InvokeOnControlThread(() => this.InvokeOnControlThread(() =>
{ {
// We must set the WS_CHILD style to change the form to a control within the Explorer preview pane
int windowStyle = GetWindowLong(this.Handle, gwlStyle);
if ((windowStyle & wsChild) == 0)
{
SetWindowLong(this.Handle, gwlStyle, windowStyle | wsChild);
}
SetParent(this.Handle, this.parentHwnd); SetParent(this.Handle, this.parentHwnd);
this.Bounds = windowBounds; this.Bounds = windowBounds;
}); });