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app: [Windows] support resize gestures for undecorated windows

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We're about to remove the client-controlled system.Action machinery
for resize gestures initiated by the client. This is the replacement
implementation for Windows, where the behaviour is hard-coded to
mimic the decorated automatic handling.

Signed-off-by: Elias Naur <mail@eliasnaur.com>
This commit is contained in:
Elias Naur
2022-06-25 14:05:03 +01:00
parent 45443a2c3a
commit fd3a3eb1b9
2 changed files with 68 additions and 4 deletions
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app/os_windows.go
+48 -2
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@@ -54,8 +54,9 @@ type window struct {
animating bool
deltas winDeltas
config Config
deltas winDeltas
borderSize image.Point
config Config
}
const _WM_WAKEUP = windows.WM_USER + iota
@@ -210,6 +211,11 @@ func (w *window) update() {
}
}
w.config.Size = size
w.borderSize = image.Pt(
windows.GetSystemMetrics(windows.SM_CXSIZEFRAME),
windows.GetSystemMetrics(windows.SM_CYSIZEFRAME),
)
w.w.Event(ConfigEvent{Config: w.config})
}
@@ -279,6 +285,15 @@ func windowProc(hwnd syscall.Handle, msg uint32, wParam, lParam uintptr) uintptr
w.w.Event(key.FocusEvent{Focus: true})
case windows.WM_KILLFOCUS:
w.w.Event(key.FocusEvent{Focus: false})
case windows.WM_NCHITTEST:
if w.config.Decorated || w.config.Mode != Windowed {
// Let the system handle it.
break
}
x, y := coordsFromlParam(lParam)
np := windows.Point{X: int32(x), Y: int32(y)}
windows.ScreenToClient(w.hwnd, &np)
return w.hitTest(int(np.X), int(np.Y))
case windows.WM_MOUSEMOVE:
x, y := coordsFromlParam(lParam)
p := f32.Point{X: float32(x), Y: float32(y)}
@@ -411,6 +426,37 @@ func getModifiers() key.Modifiers {
return kmods
}
// hitTest returns the non-client area hit by the point, needed to
// process WM_NCHITTEST.
func (w *window) hitTest(x, y int) uintptr {
top := y <= w.borderSize.Y
bottom := y >= w.config.Size.Y-w.borderSize.Y
left := x <= w.borderSize.X
right := x >= w.config.Size.X-w.borderSize.X
switch {
default:
fallthrough
case !top && !bottom && !left && !right:
return windows.HTCLIENT
case top && left:
return windows.HTTOPLEFT
case top && right:
return windows.HTTOPRIGHT
case bottom && left:
return windows.HTBOTTOMLEFT
case bottom && right:
return windows.HTBOTTOMRIGHT
case top:
return windows.HTTOP
case bottom:
return windows.HTBOTTOM
case left:
return windows.HTLEFT
case right:
return windows.HTRIGHT
}
}
func (w *window) pointerButton(btn pointer.Buttons, press bool, lParam uintptr, kmods key.Modifiers) {
var typ pointer.Type
if press {