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feat: Add will-resize event to TopLevelWindow (#13649)

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The new `will-resize` event can be used to prevent the resize from
happening before the native window is actually resized. This is in
contrast to the existing the `resize` event, which is sent *after* the
native window has already been resized. For apps with e.g. custom window
snapping logic, the `resize` event is not sufficient because it will
result in flickering between the dragged size and the snapped size.

`will-resize` is only emitted on macOS and Windows.
This commit is contained in:
Birunthan Mohanathas 2018-07-27 11:53:01 +02:00 • committed by Cheng Zhao
parent 9af9634f7d
commit c8dc2d3730
8 changed files with 56 additions and 2 deletions
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13
atom/browser/native_window_views_win.cc
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@ -187,6 +187,16 @@ bool NativeWindowViews::PreHandleMSG(UINT message,
if (HIWORD(w_param) == THBN_CLICKED)
return taskbar_host_.HandleThumbarButtonEvent(LOWORD(w_param));
return false;
case WM_SIZING: {
bool prevent_default = false;
NotifyWindowWillResize(gfx::Rect(*reinterpret_cast<RECT*>(l_param)),
&prevent_default);
if (prevent_default) {
::GetWindowRect(GetAcceleratedWidget(),
reinterpret_cast<RECT*>(l_param));
}
return false;
}
case WM_SIZE: {
// Handle window state change.
HandleSizeEvent(w_param, l_param);
@ -198,7 +208,8 @@ bool NativeWindowViews::PreHandleMSG(UINT message,
}
case WM_MOVING: {
if (!movable_)
::GetWindowRect(GetAcceleratedWidget(), (LPRECT)l_param);
::GetWindowRect(GetAcceleratedWidget(),
reinterpret_cast<RECT*>(l_param));
return false;
}
case WM_MOVE: {