/
pen.go
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/
pen.go
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// Copyright 2010 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.
package walk
import (
"github.com/wangch/win"
)
type PenStyle int
// Pen styles
const (
PenSolid PenStyle = win.PS_SOLID
PenDash PenStyle = win.PS_DASH
PenDot PenStyle = win.PS_DOT
PenDashDot PenStyle = win.PS_DASHDOT
PenDashDotDot PenStyle = win.PS_DASHDOTDOT
PenNull PenStyle = win.PS_NULL
PenInsideFrame PenStyle = win.PS_INSIDEFRAME
PenUserStyle PenStyle = win.PS_USERSTYLE
PenAlternate PenStyle = win.PS_ALTERNATE
)
// Pen cap styles (geometric pens only)
const (
PenCapRound PenStyle = win.PS_ENDCAP_ROUND
PenCapSquare PenStyle = win.PS_ENDCAP_SQUARE
PenCapFlat PenStyle = win.PS_ENDCAP_FLAT
)
// Pen join styles (geometric pens only)
const (
PenJoinBevel PenStyle = win.PS_JOIN_BEVEL
PenJoinMiter PenStyle = win.PS_JOIN_MITER
PenJoinRound PenStyle = win.PS_JOIN_ROUND
)
type Pen interface {
handle() win.HPEN
Dispose()
Style() PenStyle
Width() int
}
type nullPen struct {
hPen win.HPEN
}
func newNullPen() *nullPen {
lb := &win.LOGBRUSH{LbStyle: win.BS_NULL}
hPen := win.ExtCreatePen(win.PS_COSMETIC|win.PS_NULL, 1, lb, 0, nil)
if hPen == 0 {
panic("failed to create null brush")
}
return &nullPen{hPen: hPen}
}
func (p *nullPen) Dispose() {
if p.hPen != 0 {
win.DeleteObject(win.HGDIOBJ(p.hPen))
p.hPen = 0
}
}
func (p *nullPen) handle() win.HPEN {
return p.hPen
}
func (p *nullPen) Style() PenStyle {
return PenNull
}
func (p *nullPen) Width() int {
return 0
}
var nullPenSingleton Pen = newNullPen()
func NullPen() Pen {
return nullPenSingleton
}
type CosmeticPen struct {
hPen win.HPEN
style PenStyle
color Color
}
func NewCosmeticPen(style PenStyle, color Color) (*CosmeticPen, error) {
lb := &win.LOGBRUSH{LbStyle: win.BS_SOLID, LbColor: win.COLORREF(color)}
style |= win.PS_COSMETIC
hPen := win.ExtCreatePen(uint32(style), 1, lb, 0, nil)
if hPen == 0 {
return nil, newError("ExtCreatePen failed")
}
return &CosmeticPen{hPen: hPen, style: style, color: color}, nil
}
func (p *CosmeticPen) Dispose() {
if p.hPen != 0 {
win.DeleteObject(win.HGDIOBJ(p.hPen))
p.hPen = 0
}
}
func (p *CosmeticPen) handle() win.HPEN {
return p.hPen
}
func (p *CosmeticPen) Style() PenStyle {
return p.style
}
func (p *CosmeticPen) Color() Color {
return p.color
}
func (p *CosmeticPen) Width() int {
return 1
}
type GeometricPen struct {
hPen win.HPEN
style PenStyle
brush Brush
width int
}
func NewGeometricPen(style PenStyle, width int, brush Brush) (*GeometricPen, error) {
if brush == nil {
return nil, newError("brush cannot be nil")
}
style |= win.PS_GEOMETRIC
hPen := win.ExtCreatePen(uint32(style), uint32(width), brush.logbrush(), 0, nil)
if hPen == 0 {
return nil, newError("ExtCreatePen failed")
}
return &GeometricPen{
hPen: hPen,
style: style,
width: width,
brush: brush,
}, nil
}
func (p *GeometricPen) Dispose() {
if p.hPen != 0 {
win.DeleteObject(win.HGDIOBJ(p.hPen))
p.hPen = 0
}
}
func (p *GeometricPen) handle() win.HPEN {
return p.hPen
}
func (p *GeometricPen) Style() PenStyle {
return p.style
}
func (p *GeometricPen) Width() int {
return p.width
}
func (p *GeometricPen) Brush() Brush {
return p.brush
}