rui_orig/scrollEvent.go

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2021-09-07 17:36:50 +03:00
package rui
import "fmt"
// ScrollEvent is the constant for "scroll-event" property tag
// The "resize-event" is fired when the content of the view is scrolled.
// The main listener format: func(View, Frame).
// The additional listener formats: func(Frame), func(View), and func().
const ScrollEvent = "scroll-event"
func (view *viewData) onScroll(self View, x, y, width, height float64) {
view.scroll.Left = x
view.scroll.Top = y
view.scroll.Width = width
view.scroll.Height = height
for _, listener := range GetScrollListeners(view, "") {
listener(self, view.scroll)
}
}
func (view *viewData) Scroll() Frame {
return view.scroll
}
func (view *viewData) setScroll(x, y, width, height float64) {
view.scroll.Left = x
view.scroll.Top = y
view.scroll.Width = width
view.scroll.Height = height
}
// GetViewScroll returns ...
// If the second argument (subviewID) is "" then a value of the first argument (view) is returned
func GetViewScroll(view View, subviewID string) Frame {
if subviewID != "" {
view = ViewByID(view, subviewID)
}
if view == nil {
return Frame{}
}
return view.Scroll()
}
// GetScrollListeners returns the list of "scroll-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 GetScrollListeners(view View, subviewID string) []func(View, Frame) {
if subviewID != "" {
view = ViewByID(view, subviewID)
}
if view != nil {
if value := view.Get(ScrollEvent); value != nil {
if result, ok := value.([]func(View, Frame)); ok {
return result
}
}
}
return []func(View, Frame){}
}
// ScrollTo scrolls the view's content to the given position.
// If the second argument (subviewID) is "" then the first argument (view) is used
func ScrollViewTo(view View, subviewID string, x, y float64) {
if subviewID != "" {
view = ViewByID(view, subviewID)
}
if view != nil {
view.Session().runScript(fmt.Sprintf(`scrollTo("%s", %g, %g)`, view.htmlID(), x, y))
}
}
// ScrollViewToEnd scrolls the view's content to the start of view.
// If the second argument (subviewID) is "" then the first argument (view) is used
func ScrollViewToStart(view View, subviewID string) {
if subviewID != "" {
view = ViewByID(view, subviewID)
}
if view != nil {
view.Session().runScript(`scrollToStart("` + view.htmlID() + `")`)
}
}
// ScrollViewToEnd scrolls the view's content to the end of view.
// If the second argument (subviewID) is "" then the first argument (view) is used
func ScrollViewToEnd(view View, subviewID string) {
if subviewID != "" {
view = ViewByID(view, subviewID)
}
if view != nil {
view.Session().runScript(`scrollToEnd("` + view.htmlID() + `")`)
}
}