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win32: use SetWindowPlacement in SetBounds instead of SetWindowPos. Issue #39479

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This commit is contained in:
Ondrej Pokorny 2021-11-19 15:50:41 +01:00
parent 5f82f6ba31
commit c5c2329f62
1 changed files with 12 additions and 1 deletions
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13
lcl/interfaces/win32/win32wscontrols.pp
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@ -459,9 +459,20 @@ begin
begin
Handle := AWinControl.Handle;
WindowPlacement.length := SizeOf(WindowPlacement);
if IsIconic(Handle) and GetWindowPlacement(Handle, @WindowPlacement) then
// Windows (at least Win 10) has the feature that SetWindowPos() forces dialogs with parent windows on the same screen
// with the parent window - the position set with Windows.SetWindowPos() is ignored and instead the dialog
// is centered with its parent window.
// To prevent Windows from changing the position defined by the LCL, SetWindowPos() must not be used and
// SetWindowPlacement() must be used instead.
// It looks like GetWindowPlacement/SetWindowPlacement has no negative impact on non-form controls, so it is used directly
// In case of problems with "normal" wincontrols, the GetWindowPlacement/SetWindowPlacement code can be executed only
// for TCustomForm descendands
// See issue #39479 for more description and demo application.
if GetWindowPlacement(Handle, @WindowPlacement) then
begin
WindowPlacement.rcNormalPosition := Bounds(IntfLeft, IntfTop, IntfWidth, IntfHeight);
if not IsIconic(Handle) and not Windows.IsWindowVisible(Handle) then // do not show hidden windows prematurely
WindowPlacement.showCmd := SW_HIDE;
SetWindowPlacement(Handle, @WindowPlacement);
end
else