134 lines
2.9 KiB
Go
134 lines
2.9 KiB
Go
package ui
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import (
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"image/color"
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"opslag.de/schobers/geom"
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)
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type ClickFn func(ctx Context, c Control, pos geom.PointF32, btn MouseButton)
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type DragEndFn func(ctx Context, c Control, start, end geom.PointF32)
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type DragMoveFn func(ctx Context, c Control, start, move geom.PointF32)
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type DragStartFn func(ctx Context, c Control, start geom.PointF32)
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type MouseEnterFn func(ctx Context, c Control)
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type MouseLeaveFn func(ctx Context, c Control)
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var _ Control = &ControlBase{}
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type ControlBase struct {
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bounds geom.RectangleF32
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offset geom.PointF32
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dragStart *geom.PointF32
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over bool
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pressed bool
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onClick ClickFn
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onDragEnd DragEndFn
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onDragMove DragMoveFn
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onDragStart DragStartFn
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Background color.Color
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FontName string
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FontColor color.Color
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}
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func (c *ControlBase) Arrange(ctx Context, bounds geom.RectangleF32, offset geom.PointF32) {
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c.bounds = bounds
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c.offset = offset
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}
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func (c *ControlBase) Bounds() geom.RectangleF32 {
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return c.bounds
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}
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func (c *ControlBase) DesiredSize(Context) geom.PointF32 {
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return geom.ZeroPtF32
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}
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func (c *ControlBase) Handle(ctx Context, e Event) {
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var pos = func(e MouseEvent) geom.PointF32 { return e.Pos().Sub(c.offset) }
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var over = func(e MouseEvent) bool {
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c.over = pos(e).In(c.bounds)
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return c.over
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}
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switch e := e.(type) {
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case *MouseMoveEvent:
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over(e.MouseEvent)
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if c.pressed {
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if c.dragStart == nil {
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var start = pos(e.MouseEvent)
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c.dragStart = &start
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if c.onDragStart != nil {
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c.onDragStart(ctx, c, start)
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}
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} else {
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var start = *c.dragStart
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var move = pos(e.MouseEvent)
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if c.onDragMove != nil {
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c.onDragMove(ctx, c, start, move)
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}
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}
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}
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case *MouseButtonDownEvent:
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if over(e.MouseEvent) && 1 == e.Button {
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c.pressed = true
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}
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case *MouseButtonUpEvent:
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if 1 == e.Button {
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if c.dragStart != nil {
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var start = *c.dragStart
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var end = pos(e.MouseEvent)
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c.dragStart = nil
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if c.onDragEnd != nil {
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c.onDragEnd(ctx, c, start, end)
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}
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}
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if c.pressed {
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if c.onClick != nil {
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c.onClick(ctx, c, pos(e.MouseEvent), e.Button)
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}
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}
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c.pressed = false
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}
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}
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}
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func (c *ControlBase) IsOver() bool { return c.over }
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func (c *ControlBase) IsPressed() bool { return c.pressed }
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func (c *ControlBase) Offset() geom.PointF32 { return c.offset }
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func (c *ControlBase) OnClick(fn ClickFn) {
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c.onClick = fn
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}
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func (c *ControlBase) OnDragStart(fn DragStartFn) {
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c.onDragStart = fn
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}
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func (c *ControlBase) OnDragMove(fn DragMoveFn) {
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c.onDragMove = fn
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}
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func (c *ControlBase) OnDragEnd(fn DragEndFn) {
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c.onDragEnd = fn
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}
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func (c *ControlBase) RenderBackground(ctx Context) {
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if c.Background != nil {
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ctx.Renderer().FillRectangle(c.bounds, c.Background)
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}
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}
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func (c *ControlBase) Render(Context) {
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}
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func (c *ControlBase) fontName(ctx Context) string {
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var name = c.FontName
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if len(name) == 0 {
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name = ctx.Style().Fonts.Default
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}
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return name
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}
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