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rui/resizeEvent.go

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package rui
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// ResizeEvent is the constant for "resize-event" property tag.
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// The "resize-event" is fired when the view changes its size.
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// The main listener format:
//
// func(View, Frame).
//
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// The additional listener formats:
//
// func(Frame), func(View), and func().
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const ResizeEvent = "resize-event"
func (view *viewData) onResize(self View, x, y, width, height float64) {
view.frame.Left = x
view.frame.Top = y
view.frame.Width = width
view.frame.Height = height
for _, listener := range GetResizeListeners(view) {
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listener(self, view.frame)
}
}
func (view *viewData) onItemResize(self View, index string, x, y, width, height float64) {
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}
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func (view *viewData) setFrameListener(tag string, value any) bool {
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listeners, ok := valueToEventListeners[View, Frame](value)
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if !ok {
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notCompatibleType(tag, value)
return false
}
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if listeners == nil {
delete(view.properties, tag)
} else {
view.properties[tag] = listeners
}
view.propertyChangedEvent(tag)
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return true
}
func (view *viewData) setNoResizeEvent() {
view.noResizeEvent = true
}
func (view *viewData) isNoResizeEvent() bool {
return view.noResizeEvent
}
func (container *viewsContainerData) isNoResizeEvent() bool {
if container.noResizeEvent {
return true
}
if parent := container.Parent(); parent != nil {
return parent.isNoResizeEvent()
}
return false
}
func (view *viewData) Frame() Frame {
return view.frame
}
// GetViewFrame returns the size and location of view's viewport.
// If the second argument (subviewID) is not specified or it is "" then the value of the first argument (view) is returned
func GetViewFrame(view View, subviewID ...string) Frame {
if len(subviewID) > 0 && subviewID[0] != "" {
view = ViewByID(view, subviewID[0])
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}
if view == nil {
return Frame{}
}
return view.Frame()
}
// GetResizeListeners returns the list of "resize-event" listeners. If there are no listeners then the empty list is returned
// If the second argument (subviewID) is not specified or it is "" then the listeners list of the first argument (view) is returned
func GetResizeListeners(view View, subviewID ...string) []func(View, Frame) {
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return getEventListeners[View, Frame](view, subviewID, ResizeEvent)
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}