mirror of https://github.com/anoshenko/rui.git
92 lines
2.8 KiB
Go
92 lines
2.8 KiB
Go
package rui
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// ScrollEvent is the constant for "scroll-event" property tag.
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//
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// Used by `View`.
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// Is fired when the content of the view is scrolled.
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//
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// General listener format:
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// `func(view rui.View, frame rui.Frame)`.
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//
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// where:
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// view - Interface of a view which generated this event,
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// frame - New offset and size of the view's visible area.
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//
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// Allowed listener formats:
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// `func(frame rui.Frame)`,
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// `func(view rui.View)`,
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// `func()`.
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const ScrollEvent = "scroll-event"
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func (view *viewData) onScroll(self View, x, y, width, height float64) {
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view.scroll.Left = x
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view.scroll.Top = y
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view.scroll.Width = width
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view.scroll.Height = height
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for _, listener := range GetScrollListeners(view) {
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listener(self, view.scroll)
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}
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}
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func (view *viewData) Scroll() Frame {
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return view.scroll
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}
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func (view *viewData) setScroll(x, y, width, height float64) {
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view.scroll.Left = x
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view.scroll.Top = y
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view.scroll.Width = width
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view.scroll.Height = height
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}
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// GetViewScroll returns ...
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// If the second argument (subviewID) is not specified or it is "" then a value of the first argument (view) is returned
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func GetViewScroll(view View, subviewID ...string) Frame {
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if len(subviewID) > 0 && subviewID[0] != "" {
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view = ViewByID(view, subviewID[0])
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}
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if view == nil {
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return Frame{}
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}
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return view.Scroll()
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}
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// GetScrollListeners returns the list of "scroll-event" listeners. If there are no listeners then the empty list is returned
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// If the second argument (subviewID) is not specified or it is "" then the listeners list of the first argument (view) is returned
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func GetScrollListeners(view View, subviewID ...string) []func(View, Frame) {
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return getEventListeners[View, Frame](view, subviewID, ResizeEvent)
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}
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// ScrollTo scrolls the view's content to the given position.
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// If the second argument (subviewID) is "" then the first argument (view) is used
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func ScrollViewTo(view View, subviewID string, x, y float64) {
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if subviewID != "" {
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view = ViewByID(view, subviewID)
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}
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if view != nil {
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view.Session().callFunc("scrollTo", view.htmlID(), x, y)
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}
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}
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// ScrollViewToEnd scrolls the view's content to the start of view.
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// If the second argument (subviewID) is not specified or it is "" then the first argument (view) is used
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func ScrollViewToStart(view View, subviewID ...string) {
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if len(subviewID) > 0 && subviewID[0] != "" {
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view = ViewByID(view, subviewID[0])
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}
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if view != nil {
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view.Session().callFunc("scrollToStart", view.htmlID())
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}
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}
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// ScrollViewToEnd scrolls the view's content to the end of view.
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// If the second argument (subviewID) is not specified or it is "" then the first argument (view) is used
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func ScrollViewToEnd(view View, subviewID ...string) {
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if len(subviewID) > 0 && subviewID[0] != "" {
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view = ViewByID(view, subviewID[0])
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}
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if view != nil {
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view.Session().callFunc("scrollToEnd", view.htmlID())
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}
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}
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