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Native window decorations (Windows 10/11 only): fixed rendering artifacts on HiDPI screens when dragging window partly offscreen and back into screen bounds (issue #477)

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This commit is contained in:
Karl Tauber
2022-02-18 22:24:36 +01:00
parent 4174b065f3
commit 2e222bcdea
4 changed files with 54 additions and 0 deletions
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27
flatlaf-natives/flatlaf-natives-jna/src/main/java/com/formdev/flatlaf/natives/jna/windows/FlatWindowsNativeWindowBorder.java
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@@ -288,6 +288,7 @@ public class FlatWindowsNativeWindowBorder
private static final int GWLP_WNDPROC = -4;
private static final int
WM_MOVE = 0x0003,
WM_ERASEBKGND = 0x0014,
WM_NCCALCSIZE = 0x0083,
WM_NCHITTEST = 0x0084,
@@ -301,6 +302,10 @@ public class FlatWindowsNativeWindowBorder
WM_LBUTTONDOWN = 0x0201,
WM_LBUTTONUP = 0x0202,
WM_MOVING = 0x0216,
WM_ENTERSIZEMOVE = 0x0231,
WM_EXITSIZEMOVE = 0x0232,
WM_DWMCOLORIZATIONCOLORCHANGED = 0x0320;
// WM_SIZE wParam
@@ -341,6 +346,8 @@ public class FlatWindowsNativeWindowBorder
private final LONG_PTR defaultWndProc;
private int wmSizeWParam = -1;
private HBRUSH background;
private boolean isMovingOrSizing;
private boolean isMoving;
// Swing coordinates/values may be scaled on a HiDPI screen
private int titleBarHeight;
@@ -477,7 +484,27 @@ public class FlatWindowsNativeWindowBorder
wParam = new WPARAM( wmSizeWParam );
break;
case WM_ENTERSIZEMOVE:
isMovingOrSizing = true;
break;
case WM_EXITSIZEMOVE:
isMovingOrSizing = isMoving = false;
break;
case WM_MOVE:
case WM_MOVING:
if( isMovingOrSizing )
isMoving = true;
break;
case WM_ERASEBKGND:
// do not erase background while the user is moving the window,
// otherwise there may be rendering artifacts on HiDPI screens with Java 9+
// when dragging the window partly offscreen and back into the screen bounds
if( isMoving )
return new LRESULT( 0 );
return WmEraseBkgnd( hwnd, uMsg, wParam, lParam );
case WM_DESTROY: