Some X backend fixes

backends/x/entity.go

@@ -76,8 +76,11 @@ func (entity *entity) Window () tomo.Window {
 func (entity *entity) SetMinimumSize (width, height int) {
 	entity.minWidth  = width
 	entity.minHeight = height
-	if entity.parent == nil { return }
-	entity.parent.element.(tomo.Container).HandleChildMinimumSizeChange()
+	if entity.parent == nil {
+		entity.window.setMinimumSize(width, height)
+	} else {
+		entity.parent.element.(tomo.Container).HandleChildMinimumSizeChange()
+	}
 }
 
 func (entity *entity) DrawBackground (destination canvas.Canvas, bounds image.Rectangle) {
@@ -169,7 +172,7 @@ func (entity *entity) FocusPrevious () {
 
 // ----------- FlexibleEntity ----------- //
 
-func (entity *entity) NotifyFlexibleHeightChange () {
+func (entity *entity) NotifyFlexibleHeightChange (child tomo.Flexible) {
 	if entity.parent == nil { return }
 	if parent, ok := entity.parent.element.(tomo.FlexibleContainer); ok {
 		parent.HandleChildFlexibleHeightChange()

backends/x/event.go

@@ -121,8 +121,7 @@ func (window *window) handleKeyPress (
 	connection *xgbutil.XUtil,
 	event xevent.KeyPressEvent,
 ) {
-	if window.system.focused == nil { return }
-	if window.hasModal              { return }
+	if window.hasModal { return }
 	
 	keyEvent := *event.KeyPressEvent
 	key, numberPad := window.backend.keycodeToKey(keyEvent.Detail, keyEvent.State)
@@ -149,7 +148,6 @@ func (window *window) handleKeyRelease (
 	connection *xgbutil.XUtil,
 	event xevent.KeyReleaseEvent,
 ) {
-	if window.system.focused == nil { return }
 	keyEvent := *event.KeyReleaseEvent
 
 	// do not process this event if it was generated from a key repeat
@@ -172,11 +170,13 @@ func (window *window) handleKeyRelease (
 	key, numberPad := window.backend.keycodeToKey(keyEvent.Detail, keyEvent.State)
 	modifiers := window.modifiersFromState(keyEvent.State)
 	modifiers.NumberPad = numberPad
-	
-	focused, ok := window.focused.element.(tomo.KeyboardTarget)
-	if ok { focused.HandleKeyUp(key, modifiers) }
-	
-	window.system.afterEvent()
+
+	if window.focused != nil {
+		focused, ok := window.focused.element.(tomo.KeyboardTarget)
+		if ok { focused.HandleKeyUp(key, modifiers) }
+		
+		window.system.afterEvent()
+	}
 }
 
 func (window *window) handleButtonPress (

backends/x/window.go

@@ -48,9 +48,6 @@ func (backend *Backend) NewWindow (
 ) {
 	if backend == nil { panic("nil backend") }
 	window, err := backend.newWindow(bounds, false)
-
-	window.system.initialize()
-	window.system.pushFunc = window.paste
 	
 	output = mainWindow { window }
 	return output, err
@@ -68,6 +65,9 @@ func (backend *Backend) newWindow (
 	
 	window := &window { backend: backend }
 
+	window.system.initialize()
+	window.system.pushFunc = window.pasteAndPush
+
 	window.xWindow, err = xwindow.Generate(backend.connection)
 	if err != nil { return }
 
@@ -125,7 +125,7 @@ func (backend *Backend) newWindow (
 	window.SetConfig(backend.config)
 	
 	window.metrics.bounds = bounds
-	window.childMinimumSizeChangeCallback(8, 8)
+	window.setMinimumSize(8, 8)
 
 	window.reallocateCanvas()
 
@@ -404,6 +404,11 @@ func (window *window) reallocateCanvas () {
 	
 }
 
+func (window *window) pasteAndPush (region image.Rectangle) {
+	window.paste(region)
+	window.pushRegion(region)
+}
+
 func (window *window) paste (region image.Rectangle) {
 	canvas := canvas.Cut(window.canvas, region)
 	data, stride := canvas.Buffer()
@@ -438,7 +443,9 @@ func (window *window) pushRegion (region image.Rectangle) {
 	}
 }
 
-func (window *window) childMinimumSizeChangeCallback (width, height int) (resized bool) {
+func (window *window) setMinimumSize (width, height int) {
+	if width  < 8 { width  = 8 }
+	if height < 8 { height = 8 }
 	icccm.WmNormalHintsSet (
 		window.backend.connection,
 		window.xWindow.Id,
@@ -454,8 +461,5 @@ func (window *window) childMinimumSizeChangeCallback (width, height int) (resize
 	if newWidth != window.metrics.bounds.Dx() ||
 		newHeight != window.metrics.bounds.Dy() {
 		window.xWindow.Resize(newWidth, newHeight)
-		return true
 	}
-
-	return false
 }

elements/button.go

@@ -29,7 +29,7 @@ type Button struct {
 
 // NewButton creates a new button with the specified label text.
 func NewButton (text string) (element *Button) {
-	element = &Button { showText: true }
+	element = &Button { showText: true, enabled: true }
 	element.theme.Case = tomo.C("tomo", "button")
 	element.drawer.SetFace (element.theme.FontFace (
 		tomo.FontStyleRegular,
@@ -126,7 +126,6 @@ func (element *Button) SetConfig (new tomo.Config) {
 // Draw causes the element to draw to the specified destination canvas.
 func (element *Button) Draw (destination canvas.Canvas) {
 	if element.entity == nil { return }
-	
 	state   := element.state()
 	bounds  := element.entity.Bounds()
 	pattern := element.theme.Pattern(tomo.PatternButton, state)
@@ -183,17 +182,15 @@ func (element *Button) Draw (destination canvas.Canvas) {
 }
 
 func (element *Button) HandleFocusChange () {
-	if element.entity == nil { return }
-	element.entity.Invalidate()
+	if element.entity != nil { element.entity.Invalidate() }
 }
 
 func (element *Button) HandleMouseDown (x, y int, button input.Button) {
-	if element.entity == nil { return }
 	if !element.Enabled() { return }
 	element.Focus()
 	if button != input.ButtonLeft { return }
 	element.pressed = true
-	element.entity.Invalidate()
+	if element.entity != nil { element.entity.Invalidate() }
 }
 
 func (element *Button) HandleMouseUp (x, y int, button input.Button) {
@@ -204,23 +201,21 @@ func (element *Button) HandleMouseUp (x, y int, button input.Button) {
 	if element.Enabled() && within && element.onClick != nil {
 		element.onClick()
 	}
-	element.entity.Invalidate()
+	if element.entity != nil { element.entity.Invalidate() }
 }
 
 func (element *Button) HandleKeyDown (key input.Key, modifiers input.Modifiers) {
-	if element.entity == nil { return }
 	if !element.Enabled() { return }
 	if key == input.KeyEnter {
 		element.pressed = true
-		element.entity.Invalidate()
+		if element.entity != nil { element.entity.Invalidate() }
 	}
 }
 
 func (element *Button) HandleKeyUp(key input.Key, modifiers input.Modifiers) {
-	if element.entity == nil { return }
 	if key == input.KeyEnter && element.pressed {
 		element.pressed = false
-		element.entity.Invalidate()
+	if element.entity != nil { element.entity.Invalidate() }
 		if !element.Enabled() { return }
 		if element.onClick != nil {
 			element.onClick()

elements/checkbox.go

@@ -26,7 +26,7 @@ type Checkbox struct {
 
 // NewCheckbox creates a new cbeckbox with the specified label text.
 func NewCheckbox (text string, checked bool) (element *Checkbox) {
-	element = &Checkbox { checked: checked }
+	element = &Checkbox { checked: checked, enabled: true }
 	element.theme.Case = tomo.C("tomo", "checkbox")
 	element.drawer.SetFace (element.theme.FontFace (
 		tomo.FontStyleRegular,