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rui/resizeEvent.go

219 lines
4.6 KiB
Go

package rui
// ResizeEvent is the constant for "resize-event" property tag.
// The "resize-event" is fired when the view changes its size.
// The main listener format:
// func(View, Frame).
// The additional listener formats:
// func(Frame), func(View), and func().
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, "") {
listener(self, view.frame)
}
}
func (view *viewData) onItemResize(self View, index int, x, y, width, height float64) {
}
func (view *viewData) setFrameListener(tag string, value interface{}) bool {
if value == nil {
delete(view.properties, tag)
return true
}
switch value := value.(type) {
case func(View, Frame):
view.properties[tag] = []func(View, Frame){value}
case []func(View, Frame):
if len(value) > 0 {
view.properties[tag] = value
} else {
delete(view.properties, tag)
return true
}
case func(Frame):
fn := func(view View, frame Frame) {
value(frame)
}
view.properties[tag] = []func(View, Frame){fn}
case []func(Frame):
count := len(value)
if count == 0 {
delete(view.properties, tag)
return true
}
listeners := make([]func(View, Frame), count)
for i, val := range value {
if val == nil {
notCompatibleType(tag, val)
return false
}
listeners[i] = func(view View, frame Frame) {
val(frame)
}
}
view.properties[tag] = listeners
case func(View):
fn := func(view View, frame Frame) {
value(view)
}
view.properties[tag] = []func(View, Frame){fn}
case []func(View):
count := len(value)
if count == 0 {
delete(view.properties, tag)
return true
}
listeners := make([]func(View, Frame), count)
for i, val := range value {
if val == nil {
notCompatibleType(tag, val)
return false
}
listeners[i] = func(view View, frame Frame) {
val(view)
}
}
view.properties[tag] = listeners
case func():
fn := func(view View, frame Frame) {
value()
}
view.properties[tag] = []func(View, Frame){fn}
case []func():
count := len(value)
if count == 0 {
delete(view.properties, tag)
return true
}
listeners := make([]func(View, Frame), count)
for i, val := range value {
if val == nil {
notCompatibleType(tag, val)
return false
}
listeners[i] = func(view View, frame Frame) {
val()
}
}
view.properties[tag] = listeners
case []interface{}:
count := len(value)
if count == 0 {
delete(view.properties, tag)
return true
}
listeners := make([]func(View, Frame), count)
for i, val := range value {
if val == nil {
notCompatibleType(tag, val)
return false
}
switch val := val.(type) {
case func(View, Frame):
listeners[i] = val
case func(Frame):
listeners[i] = func(view View, frame Frame) {
val(frame)
}
case func(View):
listeners[i] = func(view View, frame Frame) {
val(view)
}
case func():
listeners[i] = func(view View, frame Frame) {
val()
}
default:
notCompatibleType(tag, val)
return false
}
}
view.properties[tag] = listeners
default:
notCompatibleType(tag, value)
return false
}
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 "" then the value of the first argument (view) is returned
func GetViewFrame(view View, subviewID string) Frame {
if subviewID != "" {
view = ViewByID(view, subviewID)
}
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 "" then the listeners list of the first argument (view) is returned
func GetResizeListeners(view View, subviewID string) []func(View, Frame) {
if subviewID != "" {
view = ViewByID(view, subviewID)
}
if view != nil {
if value := view.Get(ResizeEvent); value != nil {
if result, ok := value.([]func(View, Frame)); ok {
return result
}
}
}
return []func(View, Frame){}
}