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// Copyright 2017 The Walk Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
// +build windows
package walk
import (
"math"
)
var (
borderGlowAlpha = []float64{0.2, 0.1, 0.075, 0.05, 0.075}
InteractionEffect WidgetGraphicsEffect
FocusEffect WidgetGraphicsEffect
)
type WidgetGraphicsEffect interface {
Draw(widget Widget, canvas *Canvas) error
}
type widgetGraphicsEffectBase struct {
color Color
bitmap *Bitmap
}
func (wgeb *widgetGraphicsEffectBase) create(color Color) error {
bitmap, err := NewBitmapWithTransparentPixels(Size{12, 12})
if err != nil {
return err
}
canvas, err := NewCanvasFromImage(bitmap)
if err != nil {
return err
}
defer canvas.Dispose()
var succeeded bool
defer func() {
if !succeeded {
bitmap.Dispose()
}
}()
for i := 1; i <= 5; i++ {
bmp, err := NewBitmapWithTransparentPixels(Size{i*2 + 2, i*2 + 2})
if err != nil {
return err
}
defer bmp.Dispose()
bmpCanvas, err := NewCanvasFromImage(bmp)
if err != nil {
return err
}
defer bmpCanvas.Dispose()
color := RGB(
byte(math.Min(1.0, float64(color.R())/255.0-0.1+0.1*float64(i))*255.0),
byte(math.Min(1.0, float64(color.G())/255.0-0.1+0.1*float64(i))*255.0),
byte(math.Min(1.0, float64(color.B())/255.0-0.1+0.1*float64(i))*255.0),
)
brush, err := NewSolidColorBrush(color)
if err != nil {
return err
}
defer brush.Dispose()
if err := bmpCanvas.FillRoundedRectangle(brush, Rectangle{0, 0, i*2 + 2, i*2 + 2}, Size{i * 2, i * 2}); err != nil {
return err
}
bmpCanvas.Dispose()
opacity := byte(borderGlowAlpha[i-1] * 255.0)
canvas.DrawBitmapWithOpacity(bmp, Rectangle{5 - i, 5 - i, i*2 + 2, i*2 + 2}, opacity)
}
succeeded = true
wgeb.color = color
wgeb.bitmap = bitmap
return nil
}
func (wgeb *widgetGraphicsEffectBase) Dispose() {
if wgeb.bitmap != nil {
wgeb.bitmap.Dispose()
wgeb.bitmap = nil
}
}
type BorderGlowEffect struct {
widgetGraphicsEffectBase
}
func NewBorderGlowEffect(color Color) (*BorderGlowEffect, error) {
bge := new(BorderGlowEffect)
if err := bge.create(color); err != nil {
return nil, err
}
return bge, nil
}
func (bge *BorderGlowEffect) Draw(widget Widget, canvas *Canvas) error {
b := widget.Bounds()
canvas.DrawBitmapPart(bge.bitmap, Rectangle{b.X - 5, b.Y - 5, 5, 5}, Rectangle{0, 0, 5, 5})
canvas.DrawBitmapPart(bge.bitmap, Rectangle{b.X, b.Y - 5, b.Width, 5}, Rectangle{5 + 1, 0, 1, 5})
canvas.DrawBitmapPart(bge.bitmap, Rectangle{b.X + b.Width, b.Y - 5, 5, 5}, Rectangle{5 + 2, 0, 5, 5})
canvas.DrawBitmapPart(bge.bitmap, Rectangle{b.X + b.Width, b.Y, 5, b.Height}, Rectangle{5 + 2, 5 + 1, 5, 1})
canvas.DrawBitmapPart(bge.bitmap, Rectangle{b.X + b.Width, b.Y + b.Height, 5, 5}, Rectangle{5 + 2, 5 + 2, 5, 5})
canvas.DrawBitmapPart(bge.bitmap, Rectangle{b.X, b.Y + b.Height, b.Width, 5}, Rectangle{5 + 1, 5 + 2, 1, 5})
canvas.DrawBitmapPart(bge.bitmap, Rectangle{b.X - 5, b.Y + b.Height, 5, 5}, Rectangle{0, 5 + 2, 5, 5})
canvas.DrawBitmapPart(bge.bitmap, Rectangle{b.X - 5, b.Y, 5, b.Height}, Rectangle{0, 5 + 1, 5, 1})
return nil
}
type DropShadowEffect struct {
widgetGraphicsEffectBase
}
func NewDropShadowEffect(color Color) (*DropShadowEffect, error) {
dse := new(DropShadowEffect)
if err := dse.create(color); err != nil {
return nil, err
}
return dse, nil
}
func (dse *DropShadowEffect) Draw(widget Widget, canvas *Canvas) error {
b := widget.Bounds()
canvas.DrawBitmapPart(dse.bitmap, Rectangle{b.X + b.Width, b.Y + 10 - 5, 5, 5}, Rectangle{5 + 2, 0, 5, 5})
canvas.DrawBitmapPart(dse.bitmap, Rectangle{b.X + b.Width, b.Y + 10, 5, b.Height - 10}, Rectangle{5 + 2, 5 + 1, 5, 1})
canvas.DrawBitmapPart(dse.bitmap, Rectangle{b.X + b.Width, b.Y + b.Height, 5, 5}, Rectangle{5 + 2, 5 + 2, 5, 5})
canvas.DrawBitmapPart(dse.bitmap, Rectangle{b.X + 10, b.Y + b.Height, b.Width - 10, 5}, Rectangle{5 + 1, 5 + 2, 1, 5})
canvas.DrawBitmapPart(dse.bitmap, Rectangle{b.X + 10 - 5, b.Y + b.Height, 5, 5}, Rectangle{0, 5 + 2, 5, 5})
return nil
}
type widgetGraphicsEffectListObserver interface {
onInsertedGraphicsEffect(index int, effect WidgetGraphicsEffect) error
onRemovedGraphicsEffect(index int, effect WidgetGraphicsEffect) error
onClearedGraphicsEffects() error
}
type WidgetGraphicsEffectList struct {
items []WidgetGraphicsEffect
observer widgetGraphicsEffectListObserver
}
func newWidgetGraphicsEffectList(observer widgetGraphicsEffectListObserver) *WidgetGraphicsEffectList {
return &WidgetGraphicsEffectList{observer: observer}
}
func (l *WidgetGraphicsEffectList) Add(effect WidgetGraphicsEffect) error {
if effect == nil {
return newError("effect == nil")
}
return l.Insert(len(l.items), effect)
}
func (l *WidgetGraphicsEffectList) At(index int) WidgetGraphicsEffect {
return l.items[index]
}
func (l *WidgetGraphicsEffectList) Clear() error {
observer := l.observer
oldItems := l.items
l.items = l.items[:0]
if observer != nil {
if err := observer.onClearedGraphicsEffects(); err != nil {
l.items = oldItems
return err
}
}
return nil
}
func (l *WidgetGraphicsEffectList) Index(effect WidgetGraphicsEffect) int {
for i, item := range l.items {
if item == effect {
return i
}
}
return -1
}
func (l *WidgetGraphicsEffectList) Contains(effect WidgetGraphicsEffect) bool {
return l.Index(effect) > -1
}
func (l *WidgetGraphicsEffectList) insertIntoSlice(index int, effect WidgetGraphicsEffect) {
l.items = append(l.items, nil)
copy(l.items[index+1:], l.items[index:])
l.items[index] = effect
}
func (l *WidgetGraphicsEffectList) Insert(index int, effect WidgetGraphicsEffect) error {
observer := l.observer
l.insertIntoSlice(index, effect)
if observer != nil {
if err := observer.onInsertedGraphicsEffect(index, effect); err != nil {
l.items = append(l.items[:index], l.items[index+1:]...)
return err
}
}
return nil
}
func (l *WidgetGraphicsEffectList) Len() int {
return len(l.items)
}
func (l *WidgetGraphicsEffectList) Remove(effect WidgetGraphicsEffect) error {
index := l.Index(effect)
if index == -1 {
return nil
}
return l.RemoveAt(index)
}
func (l *WidgetGraphicsEffectList) RemoveAt(index int) error {
observer := l.observer
item := l.items[index]
l.items = append(l.items[:index], l.items[index+1:]...)
if observer != nil {
if err := observer.onRemovedGraphicsEffect(index, item); err != nil {
l.insertIntoSlice(index, item)
return err
}
}
return nil
}
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