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app/window,app/internal/window: allow min/max window size

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The app.MinSize and app.MaxSize options restricts the window size:

w := app.NewWindow(
	app.Size(unit.Dp(600), unit.Dp(596)),
	app.MinSize(unit.Dp(600), unit.Dp(596)),
	app.MaxSize(unit.Dp(600), unit.Dp(596)),
	app.Title(APPNAME),
)

Signed-off-by: Jason <sourcehut@sweatyballs.es>
This commit is contained in:
Jason
2020-06-22 12:49:41 +02:00
committed by Elias Naur
parent 20cf570709
commit 9cfbdafe14
7 changed files with 150 additions and 33 deletions
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app/internal/window/os_windows.go
+49 -1
View File
@@ -27,6 +27,16 @@ import (
"gioui.org/io/system"
)
type winConstraints struct {
minWidth, minHeight int32
maxWidth, maxHeight int32
}
type winDeltas struct {
width int32
height int32
}
type window struct {
hwnd syscall.Handle
hdc syscall.Handle
@@ -39,6 +49,10 @@ type window struct {
mu sync.Mutex
animating bool
minmax winConstraints
deltas winDeltas
opts *Options
}
const _WM_REDRAW = windows.WM_USER + 0
@@ -137,6 +151,15 @@ func initResources() error {
return nil
}
func getWindowConstraints(cfg unit.Metric, opts *Options, d winDeltas) winConstraints {
var minmax winConstraints
minmax.minWidth = int32(cfg.Px(opts.MinWidth)) + d.width
minmax.minHeight = int32(cfg.Px(opts.MinHeight)) + d.height
minmax.maxWidth = int32(cfg.Px(opts.MaxWidth)) + d.width
minmax.maxHeight = int32(cfg.Px(opts.MaxHeight)) + d.height
return minmax
}
func createNativeWindow(opts *Options) (*window, error) {
var resErr error
resources.once.Do(func() {
@@ -152,7 +175,14 @@ func createNativeWindow(opts *Options) (*window, error) {
}
dwStyle := uint32(windows.WS_OVERLAPPEDWINDOW)
dwExStyle := uint32(windows.WS_EX_APPWINDOW | windows.WS_EX_WINDOWEDGE)
deltas := winDeltas{
width: wr.Right,
height: wr.Bottom,
}
windows.AdjustWindowRectEx(&wr, dwStyle, 0, dwExStyle)
deltas.width = wr.Right - wr.Left - deltas.width
deltas.height = wr.Bottom - wr.Top - deltas.height
hwnd, err := windows.CreateWindowEx(dwExStyle,
resources.class,
opts.Title,
@@ -168,7 +198,10 @@ func createNativeWindow(opts *Options) (*window, error) {
return nil, err
}
w := &window{
hwnd: hwnd,
hwnd: hwnd,
minmax: getWindowConstraints(cfg, opts, deltas),
deltas: deltas,
opts: opts,
}
w.hdc, err = windows.GetDC(hwnd)
if err != nil {
@@ -251,6 +284,20 @@ func windowProc(hwnd syscall.Handle, msg uint32, wParam, lParam uintptr) uintptr
case windows.SIZE_MAXIMIZED, windows.SIZE_RESTORED:
w.setStage(system.StageRunning)
}
case windows.WM_GETMINMAXINFO:
mm := (*windows.MinMaxInfo)(unsafe.Pointer(uintptr(lParam)))
if w.minmax.minWidth > 0 || w.minmax.minHeight > 0 {
mm.PtMinTrackSize = windows.Point{
w.minmax.minWidth,
w.minmax.minHeight,
}
}
if w.minmax.maxWidth > 0 || w.minmax.maxHeight > 0 {
mm.PtMaxTrackSize = windows.Point{
w.minmax.maxWidth,
w.minmax.maxHeight,
}
}
}
return windows.DefWindowProc(hwnd, msg, wParam, lParam)
@@ -375,6 +422,7 @@ func (w *window) draw(sync bool) {
return
}
cfg := configForDC()
w.minmax = getWindowConstraints(cfg, w.opts, w.deltas)
w.w.Event(FrameEvent{
FrameEvent: system.FrameEvent{
Now: time.Now(),