Windows: Custom frame behavior

A borderless SDL window gets no standard window behavior, so
this commit implements support for some of them. There is
special handling for the window frame and various snapping modes.

Not quite finished yet... It might make sense to research if
a custom window class could work with this app (with SDL); could be
less work.

1 files changed, 31 insertions, 3 deletions

diff --git a/src/ui/window.h b/src/ui/window.h
index 5bde9065..ddb03847 100644
--- a/src/ui/window.h
+++ b/src/ui/window.h
@@ -32,13 +32,35 @@ SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. */
 iDeclareType(Window)
 iDeclareTypeConstructionArgs(Window, iRect rect)
 
+enum iWindowSnap {
+    none_WindowSnap       = 0,
+    left_WindowSnap       = 1,
+    right_WindowSnap      = 2,
+    maximized_WindowSnap  = 3,
+    yMaximized_WindowSnap = 4,
+    fullscreen_WindowSnap = 5,
+    mask_WindowSnap       = 0xff,
+    topBit_WindowSnap     = iBit(9),
+    bottomBit_WindowSnap  = iBit(10),
+};
+
+iDeclareType(WindowPlacement)
+
+/* Tracking of window placement. */
+struct Impl_WindowPlacement {
+    iInt2 initialPos;
+    iRect normalRect;       /* updated when window is moved/resized */
+    iInt2 lastNotifiedSize; /* keep track of horizontal/vertical notifications */
+    int   snap;             /* LAGRANGE_CUSTOM_FRAME */
+    int   lastHit;
+};
+
 struct Impl_Window {
     SDL_Window *  win;
-    iInt2         initialPos;
-    iRect         lastRect; /* updated when window is moved/resized */
-    iInt2         lastNotifiedSize; /* keep track of horizontal/vertical notifications */
+    iWindowPlacement place;
     iBool         isDrawFrozen; /* avoids premature draws while restoring window state */
     iBool         isExposed;
+    iBool         isMinimized;
     iBool         isMouseInside;
     uint32_t      focusGainedAt;
     SDL_Renderer *render;
@@ -60,6 +82,7 @@ void        setTitle_Window         (iWindow *, const iString *title);
 void        setUiScale_Window       (iWindow *, float uiScale);
 void        setFreezeDraw_Window    (iWindow *, iBool freezeDraw);
 void        setCursor_Window        (iWindow *, int cursor);
+void        setSnap_Window          (iWindow *, int snapMode);
 
 uint32_t    id_Window               (const iWindow *);
 iInt2       rootSize_Window         (const iWindow *);
@@ -68,6 +91,11 @@ iInt2       coord_Window            (const iWindow *, int x, int y);
 iInt2       mouseCoord_Window       (const iWindow *);
 uint32_t    frameTime_Window        (const iWindow *);
 SDL_Renderer *renderer_Window       (const iWindow *);
+int         snap_Window             (const iWindow *);
 iBool       isFullscreen_Window     (const iWindow *);
 
 iWindow *   get_Window              (void);
+
+#if defined (LAGRANGE_CUSTOM_FRAME)
+SDL_HitTestResult hitTest_Window(const iWindow *d, iInt2 pos);
+#endif