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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 (
"github.com/lxn/win"
)
type GradientComposite struct {
*Composite
vertical bool
color1 Color
color2 Color
verticalChangedPublisher EventPublisher
color1ChangedPublisher EventPublisher
color2ChangedPublisher EventPublisher
brush *BitmapBrush
}
func NewGradientComposite(parent Container) (*GradientComposite, error) {
return NewGradientCompositeWithStyle(parent, 0)
}
func NewGradientCompositeWithStyle(parent Container, style uint32) (*GradientComposite, error) {
composite, err := NewCompositeWithStyle(parent, style)
if err != nil {
return nil, err
}
gc := &GradientComposite{Composite: composite}
succeeded := false
defer func() {
if !succeeded {
gc.Dispose()
}
}()
if err := InitWrapperWindow(gc); err != nil {
return nil, err
}
gc.MustRegisterProperty("Vertical", NewBoolProperty(
func() bool {
return gc.Vertical()
},
func(b bool) error {
gc.SetVertical(b)
return nil
},
gc.verticalChangedPublisher.Event()))
gc.MustRegisterProperty("Color1", NewProperty(
func() interface{} {
return float64(uint32(gc.Color1()))
},
func(v interface{}) error {
var c Color
switch v := v.(type) {
case Color:
c = v
case uint32:
c = Color(v)
case float64:
c = Color(uint32(v))
default:
return ErrInvalidType
}
return gc.SetColor1(c)
},
gc.color1ChangedPublisher.Event()))
gc.MustRegisterProperty("Color2", NewProperty(
func() interface{} {
return float64(uint32(gc.Color2()))
},
func(v interface{}) error {
var c Color
switch v := v.(type) {
case Color:
c = v
case uint32:
c = Color(v)
case float64:
c = Color(uint32(v))
default:
return ErrInvalidType
}
return gc.SetColor2(c)
},
gc.color2ChangedPublisher.Event()))
succeeded = true
return gc, nil
}
func (gc *GradientComposite) Vertical() bool {
return gc.vertical
}
func (gc *GradientComposite) SetVertical(vertical bool) (err error) {
if vertical == gc.vertical {
return nil
}
old := gc.vertical
defer func() {
if err != nil {
gc.vertical = old
}
}()
gc.vertical = vertical
if err = gc.updateBackground(); err != nil {
return
}
gc.verticalChangedPublisher.Publish()
return
}
func (gc *GradientComposite) Color1() Color {
return gc.color1
}
func (gc *GradientComposite) SetColor1(c Color) (err error) {
if c == gc.color1 {
return nil
}
old := gc.color1
defer func() {
if err != nil {
gc.color1 = old
}
}()
gc.color1 = c
if err = gc.updateBackground(); err != nil {
return
}
gc.color1ChangedPublisher.Publish()
return
}
func (gc *GradientComposite) Color2() Color {
return gc.color2
}
func (gc *GradientComposite) SetColor2(c Color) (err error) {
if c == gc.color2 {
return nil
}
old := gc.color2
defer func() {
if err != nil {
gc.color2 = old
}
}()
gc.color2 = c
if err = gc.updateBackground(); err != nil {
return
}
gc.color2ChangedPublisher.Publish()
return
}
func (gc *GradientComposite) updateBackground() error {
bounds := gc.ClientBounds()
if bounds.Width < 1 || bounds.Height < 1 {
return nil
}
if gc.brush != nil {
gc.brush.Dispose()
gc.brush.Bitmap().Dispose()
gc.brush = nil
}
if gc.vertical {
bounds.Width = 1
} else {
bounds.Height = 1
}
bmp, err := NewBitmap(bounds.Size())
if err != nil {
return err
}
defer func() {
if gc.brush == nil {
bmp.Dispose()
}
}()
canvas, err := NewCanvasFromImage(bmp)
if err != nil {
return err
}
defer canvas.Dispose()
var orientation Orientation
if gc.vertical {
orientation = Vertical
} else {
orientation = Horizontal
}
if err := canvas.GradientFillRectangle(gc.color1, gc.color2, orientation, bounds); err != nil {
return err
}
gc.brush, err = NewBitmapBrush(bmp)
if err != nil {
return err
}
gc.SetBackground(gc.brush)
return nil
}
func (gc *GradientComposite) Dispose() {
if gc.brush != nil {
gc.SetBackground(nil)
gc.brush.Dispose()
gc.brush.Bitmap().Dispose()
gc.brush = nil
}
gc.Composite.Dispose()
}
func (gc *GradientComposite) WndProc(hwnd win.HWND, msg uint32, wParam, lParam uintptr) uintptr {
switch msg {
case win.WM_SIZE, win.WM_SIZING:
size := gc.ClientBounds().Size()
if gc.brush != nil && gc.brush.bitmap.size == size {
break
}
gc.updateBackground()
}
return gc.Composite.WndProc(hwnd, msg, wParam, lParam)
}
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