Nick Thomas
bfe9fbdf7d
With this commit, we get a ui.Interface and ui.Widget type. The interface monitors hover and mouse click state and tells the widgets about them; the widgets execute code specified by the application when events occur. Next step: have wh40k load the main menu and play sound, etc.
85 lines
1.8 KiB
Go
85 lines
1.8 KiB
Go
package ui
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import (
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"image"
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"github.com/hajimehoshi/ebiten"
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"code.ur.gs/lupine/ordoor/internal/assetstore"
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"code.ur.gs/lupine/ordoor/internal/menus"
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)
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// Widget represents an interactive area of the screen. Backgrounds and other
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// non-interactive areas are not widgets.
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type Widget struct {
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// Position on the screen in original (i.e., unscaled) coordinates
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Bounds image.Rectangle
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// Tooltip string // TODO: show the tooltip when hovering?
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OnHoverEnter func()
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OnHoverLeave func()
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// Mouse up can happen without a click taking place if, for instance, the
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// mouse cursor leaves the bounds while still pressed.
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OnMouseDown func()
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OnMouseClick func()
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OnMouseUp func()
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// These are expected to have the same dimensions as the Bounds
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hoverAnimation []*ebiten.Image
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hoverState bool
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// FIXME: We assume right mouse button isn't needed here
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// TODO: down, up, and click hooks.
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mouseButtonDownImage *ebiten.Image
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mouseButtonState bool
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path []int
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record *menus.Record
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sprite *assetstore.Sprite
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}
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func (w *Widget) hovering(value bool) {
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if w.OnHoverEnter != nil && !w.hoverState && value {
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w.OnHoverEnter()
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}
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if w.OnHoverLeave != nil && w.hoverState && !value {
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w.OnHoverLeave()
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}
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w.hoverState = value
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return
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}
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func (w *Widget) mouseButton(value bool) {
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if w.OnMouseDown != nil && !w.mouseButtonState && value {
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w.OnMouseDown()
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}
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if w.mouseButtonState && !value {
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if w.OnMouseClick != nil && w.hoverState {
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w.OnMouseClick()
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}
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if w.OnMouseUp != nil {
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w.OnMouseUp()
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}
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}
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w.mouseButtonState = value
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}
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func (w *Widget) Image(aniStep int) (*ebiten.Image, error) {
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if w.hoverState && w.mouseButtonState {
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return w.mouseButtonDownImage, nil
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}
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if w.hoverState && len(w.hoverAnimation) > 0 {
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return w.hoverAnimation[(aniStep)%len(w.hoverAnimation)], nil
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}
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return w.sprite.Image, nil
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}
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