Noah Petherbridge
f9b305679a
* Tooltip can be added to any target widget (e.g. Button) and pop up on mouse over. * Refactor the event system. Instead of passing a render.Point to all event handlers, pass an EventData struct which can hold the Point or the render.Engine. * Add event types Computed and Present, so a widget can set a handler on whenever its Computed or Present method is called.
114 lines
2.4 KiB
Go
114 lines
2.4 KiB
Go
package ui
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import (
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"errors"
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"fmt"
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"git.kirsle.net/go/render"
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)
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// Frame is a widget that contains other widgets.
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type Frame struct {
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Name string
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BaseWidget
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// Widget placement settings.
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packs map[Side][]packedWidget // Packed widgets
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placed []placedWidget // Placed widgets
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widgets []Widget
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}
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// NewFrame creates a new Frame.
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func NewFrame(name string) *Frame {
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w := &Frame{
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Name: name,
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packs: map[Side][]packedWidget{},
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widgets: []Widget{},
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}
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w.SetBackground(render.RGBA(1, 0, 0, 0)) // invisible default BG
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w.IDFunc(func() string {
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return fmt.Sprintf("Frame<%s>",
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name,
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)
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})
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return w
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}
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// Setup ensures all the Frame's data is initialized and not null.
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func (w *Frame) Setup() {
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if w.packs == nil {
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w.packs = map[Side][]packedWidget{}
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}
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if w.widgets == nil {
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w.widgets = []Widget{}
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}
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}
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// Add a child widget to the frame. When the frame Presents itself, it also
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// presents child widgets. This method is safe to call multiple times: it ensures
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// the widget is not already a child of the Frame before adding it.
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func (w *Frame) Add(child Widget) error {
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if child == w {
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return errors.New("can't add self to frame")
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}
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// Ensure child is new to the frame.
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for _, widget := range w.widgets {
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if widget == child {
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return errors.New("widget already added to frame")
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}
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}
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w.widgets = append(w.widgets, child)
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return nil
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}
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// Children returns all of the child widgets.
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func (w *Frame) Children() []Widget {
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return w.widgets
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}
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// Compute the size of the Frame.
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func (w *Frame) Compute(e render.Engine) {
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w.computePacked(e)
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w.computePlaced(e)
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// Call the BaseWidget Compute in case we have subscribers.
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w.BaseWidget.Compute(e)
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}
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// Present the Frame.
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func (w *Frame) Present(e render.Engine, P render.Point) {
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if w.Hidden() {
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return
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}
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var (
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S = w.Size()
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)
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// Draw the widget's border and everything.
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w.DrawBox(e, P)
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// Draw the background color.
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e.DrawBox(w.Background(), render.Rect{
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X: P.X + w.BoxThickness(1),
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Y: P.Y + w.BoxThickness(1),
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W: S.W - w.BoxThickness(2),
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H: S.H - w.BoxThickness(2),
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})
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// Draw the widgets.
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for _, child := range w.widgets {
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// child.Compute(e)
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p := child.Point()
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moveTo := render.NewPoint(
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P.X+p.X+w.BoxThickness(1),
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P.Y+p.Y+w.BoxThickness(1),
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)
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child.Present(e, moveTo)
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}
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// Call the BaseWidget Present in case we have subscribers.
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w.BaseWidget.Present(e, P)
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}
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