Introduced a new property TfpgWindowBase.WindowState

This is an initial implementation for Linux only. Currently this property
is read-only, but that alone is already very useful. Next I'll implement
the Windows support, and later the read-write support.

2 files changed, 78 insertions, 0 deletions

diff --git a/src/corelib/fpg_base.pas b/src/corelib/fpg_base.pas
index c65d8176..ae745a71 100644
--- a/src/corelib/fpg_base.pas
+++ b/src/corelib/fpg_base.pas
@@ -58,6 +58,8 @@ type
       waOneThirdDownPos);
   TWindowAttributes = set of TWindowAttribute;
 
+  TfpgWindowState = (wsNormal, wsMinimized, wsMaximized);
+
   TMouseCursor = (mcDefault, mcArrow, mcCross, mcIBeam, mcSizeEW, mcSizeNS,
       mcSizeNWSE, mcSizeNESW, mcSizeSWNE, mcSizeSENW, mcMove, mcHourGlass,
       mcHand, mcDrag, mcNoDrop);
@@ -444,6 +446,7 @@ type
     FMouseCursorIsDirty: Boolean;
     FOnDragStartDetected: TNotifyEvent;
     FDragActive: boolean;
+    FWindowState: TfpgWindowState;
     function    HandleIsValid: boolean; virtual; abstract;
     procedure   DoUpdateWindowPosition; virtual; abstract;
     procedure   DoAllocateWindowHandle(AParent: TfpgWindowBase); virtual; abstract;
@@ -456,6 +459,8 @@ type
     procedure   DoSetMouseCursor; virtual; abstract;
     procedure   DoDNDEnabled(const AValue: boolean); virtual; abstract;
     procedure   DoAcceptDrops(const AValue: boolean); virtual; abstract;
+    function    GetWindowState: TfpgWindowState; virtual;
+    procedure   SetWindowState(const AValue: TfpgWindowState); virtual;
     procedure   DoDragStartDetected; virtual;
     procedure   SetParent(const AValue: TfpgWindowBase); virtual;
     function    GetParent: TfpgWindowBase; virtual;
@@ -470,6 +475,7 @@ type
     procedure   HandleMove(x, y: TfpgCoord); virtual;
     procedure   HandleResize(AWidth, AHeight: TfpgCoord); virtual;
     property    OnDragStartDetected: TNotifyEvent read FOnDragStartDetected write FOnDragStartDetected;
+    property    WindowState: TfpgWindowState read GetWindowState {write SetWindowState} default wsNormal;
   public
     // The standard constructor.
     constructor Create(AOwner: TComponent); override;
@@ -1151,6 +1157,16 @@ begin
     Result := MinHeight;
 end;
 
+function TfpgWindowBase.GetWindowState: TfpgWindowState;
+begin
+  Result := FWindowState;
+end;
+
+procedure TfpgWindowBase.SetWindowState(const AValue: TfpgWindowState);
+begin
+  // do nothing
+end;
+
 procedure TfpgWindowBase.DoDragStartDetected;
 begin
   if Assigned(FOnDragStartDetected) then
@@ -1270,6 +1286,7 @@ begin
   FMaxWidth := 0;
   FMaxHeight := 0;
   FDragActive := False;
+  FWindowState := wsNormal;
 end;
 
 procedure TfpgWindowBase.AfterConstruction;
diff --git a/src/corelib/x11/fpg_x11.pas b/src/corelib/x11/fpg_x11.pas
index ff5ac9ce..79f83e6e 100644
--- a/src/corelib/x11/fpg_x11.pas
+++ b/src/corelib/x11/fpg_x11.pas
@@ -235,6 +235,7 @@ type
     procedure   DoDNDEnabled(const AValue: boolean); override;
     procedure   DoAcceptDrops(const AValue: boolean); override;
     property    WinHandle: TfpgWinHandle read FWinHandle;
+    function    GetWindowState: TfpgWindowState; override;
   public
     constructor Create(AOwner: TComponent); override;
     procedure   ActivateWindow; override;
@@ -2439,6 +2440,66 @@ begin
   { TODO : Remove EnableDrops, then recurse from here to parent top level from, and set XDNDAware property for form. }
 end;
 
+function TfpgX11Window.GetWindowState: TfpgWindowState;
+type
+  TWMStateType = (wms_none, wms_normal, wms_withdrawn, wms_iconic);
+  wmstate = record
+    state: longword;
+    icon: PtrUInt;
+  end;
+  pwmstate = ^wmstate;
+var
+  actualtype: TAtom = None;
+  actualformat: cint;
+  count, remaining: culong;
+  data: pwmstate = nil;
+  lWindowStates: TNetWindowStates;
+  maxh, maxv: boolean;
+begin
+  Result := inherited GetWindowState;
+
+  if XGetWindowProperty(xapplication.Display, FWinHandle, xapplication.xia_wm_state, 0, 1,
+      TBool(False), xapplication.xia_wm_state, @actualtype, @actualformat, @count,
+      @remaining, @data) = Success then
+  begin
+    if (actualformat = 32) and (count = 1) then
+    begin
+      case data^.State of
+        Ord(wms_none):
+            begin
+              // do nothing
+            end;
+        Ord(wms_normal):
+            begin
+              Result := wsNormal;
+              maxh := false;
+              maxv := false;
+              xapplication.netlayer.WindowGetState(FWinHandle, lWindowStates);
+              if nwsFullScreen in lWindowStates then
+                Result := wsMaximized; // not really true, but ok for now
+              if nwsMaxVert in lWindowStates then
+                maxv := True;
+              if nwsMaxHorz in lWindowStates then
+                maxh := True;
+              if (Result = wsNormal) and maxv and maxh then
+                Result := wsMaximized;
+            end;
+        Ord(wms_withdrawn):
+            begin
+              // do nothing
+            end;
+        Ord(wms_iconic):
+            begin
+              Result := wsMinimized;
+            end;
+      end; { case }
+    end; { if }
+  end;  { if }
+
+  if data <> nil then
+    XFree(data);
+end;
+
 procedure TfpgX11Window.DoSetWindowTitle(const ATitle: string);
 var
   tp: TXTextProperty;