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unit gfx_popupwindow;
{$mode objfpc}{$H+}
interface
uses
Classes,
SysUtils,
gfxbase,
fpgfx,
gfx_widget,
gfx_impl;
type
TfpgPopupWindow = class(TfpgWidget)
private
FDontCloseWidget: TfpgWidget;
protected
procedure MsgClose(var msg: TfpgMessageRec); message FPGM_CLOSE;
procedure AdjustWindowStyle; override;
procedure HandleShow; override;
procedure HandleHide; override;
procedure HandleClose; virtual;
public
constructor Create(AOwner: TComponent); override;
procedure ShowAt(AWidget: TfpgWidget; x, y: TfpgCoord);
procedure Close; virtual;
property DontCloseWidget: TfpgWidget read FDontCloseWidget write FDontCloseWidget;
end;
procedure ClosePopups;
function PopupListFirst: TfpgPopupWindow;
function PopupListFind(AWinHandle: TfpgWinHandle): TfpgPopupWindow;
function PopupDontCloseWidget(AWidget: TfpgWidget): boolean;
implementation
type
// Popup window linked list. Maybe we can implemnt it via a TList as well.
PPopupListRec = ^PopupListRec;
PopupListRec = record
Widget: TfpgPopupWindow;
Next: PPopupListRec;
end;
var
uOriginalFocusRoot: TfpgWidget;
uFirstPopup: PPopupListRec;
uLastPopup: PPopupListRec;
// local helper functions
procedure ClosePopups;
begin
while uFirstPopup <> nil do
begin
TfpgPopupWindow(uFirstPopup^.Widget).Close;
end;
end;
procedure PopupListAdd(pw: TfpgPopupWindow);
var
p: PPopupListRec;
begin
if pw = nil then
Exit; //==>
if uFirstPopup = nil then
uOriginalFocusRoot := FocusRootWidget;
FocusRootWidget := pw;
New(p);
p^.Widget := pw;
p^.Next := nil;
if uFirstPopup = nil then
uFirstPopup := p
else
uLastPopup^.Next := p;
uLastPopup := p;
end;
procedure PopupListRemove(pw: TfpgPopupWindow);
var
prevp: PPopupListRec;
p: PPopupListRec;
px: PPopupListRec;
begin
p := uFirstPopup;
prevp := nil;
while p <> nil do
begin
if p^.Widget = pw then
begin
if prevp = nil then
uFirstPopup := p^.Next
else
prevp^.Next := p^.Next;
if uLastPopup = p then
uLastPopup := prevp;
px := p;
p := p^.Next;
Dispose(px);
end
else
begin
prevp := p;
p := p^.Next;
end;
end;
if uLastPopup <> nil then
FocusRootWidget := uLastPopup^.Widget
else
FocusRootWidget := uOriginalFocusRoot;
end;
function PopupListFirst: TfpgPopupWindow;
begin
if uFirstPopup <> nil then
Result := uFirstPopup^.Widget
else
Result := nil;
end;
function PopupListFind(AWinHandle: TfpgWinHandle): TfpgPopupWindow;
var
p: PPopupListRec;
begin
p := uFirstPopup;
while p <> nil do
begin
if p^.Widget.WinHandle = AWinHandle then
begin
Result := p^.Widget;
Exit; //==>
end;
p := p^.Next;
end;
Result := nil;
end;
function PopupDontCloseWidget(AWidget: TfpgWidget): boolean;
var
p: PPopupListRec;
begin
Result := False;
if AWidget = nil then
Exit; //==>
p := uFirstPopup;
while p <> nil do
begin
if p^.Widget.DontCloseWidget = AWidget then
begin
Result := True;
Exit; //==>
end;
p := p^.Next;
end;
end;
{ TfpgPopupWindow }
procedure TfpgPopupWindow.MsgClose(var msg: TfpgMessageRec);
begin
HandleClose;
end;
procedure TfpgPopupWindow.AdjustWindowStyle;
begin
inherited AdjustWindowStyle;
// We could possibly change this later
Exclude(FWindowAttributes, waSizeable);
end;
procedure TfpgPopupWindow.HandleShow;
begin
inherited HandleShow;
CaptureMouse;
end;
procedure TfpgPopupWindow.HandleHide;
begin
ReleaseMouse;
inherited HandleHide;
end;
procedure TfpgPopupWindow.HandleClose;
begin
HandleHide;
end;
constructor TfpgPopupWindow.Create(AOwner: TComponent);
begin
inherited Create(AOwner);
WindowType := wtPopup;
FDontCloseWidget := nil;
Parent := nil;
end;
procedure TfpgPopupWindow.ShowAt(AWidget: TfpgWidget; x, y: TfpgCoord);
var
pt: TPoint;
begin
PopupListAdd(self);
DontCloseWidget := nil;
// translate coordinates
pt := WindowToScreen(AWidget, Point(x, y));
// reposition
Left := pt.X;
Top := pt.Y;
// and show
HandleShow;
end;
procedure TfpgPopupWindow.Close;
begin
HandleHide;
PopupListRemove(self);
end;
initialization
uFirstPopup := nil;
uLastPopup := nil;
end.
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