123 lines
2.5 KiB
Go
123 lines
2.5 KiB
Go
// Copyright 2018 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 (
|
|
"sync"
|
|
)
|
|
|
|
type TextLabel struct {
|
|
static
|
|
textChangedPublisher EventPublisher
|
|
}
|
|
|
|
func NewTextLabel(parent Container) (*TextLabel, error) {
|
|
return NewTextLabelWithStyle(parent, 0)
|
|
}
|
|
|
|
func NewTextLabelWithStyle(parent Container, style uint32) (*TextLabel, error) {
|
|
tl := new(TextLabel)
|
|
|
|
if err := tl.init(tl, parent); err != nil {
|
|
return nil, err
|
|
}
|
|
|
|
tl.textAlignment = AlignHNearVNear
|
|
|
|
tl.MustRegisterProperty("Text", NewProperty(
|
|
func() interface{} {
|
|
return tl.Text()
|
|
},
|
|
func(v interface{}) error {
|
|
return tl.SetText(assertStringOr(v, ""))
|
|
},
|
|
tl.textChangedPublisher.Event()))
|
|
|
|
return tl, nil
|
|
}
|
|
|
|
func (tl *TextLabel) asStatic() *static {
|
|
return &tl.static
|
|
}
|
|
|
|
func (tl *TextLabel) TextAlignment() Alignment2D {
|
|
return tl.textAlignment
|
|
}
|
|
|
|
func (tl *TextLabel) SetTextAlignment(alignment Alignment2D) error {
|
|
if alignment == AlignHVDefault {
|
|
alignment = AlignHNearVNear
|
|
}
|
|
|
|
return tl.setTextAlignment(alignment)
|
|
}
|
|
|
|
func (tl *TextLabel) Text() string {
|
|
return tl.text()
|
|
}
|
|
|
|
func (tl *TextLabel) SetText(text string) error {
|
|
if changed, err := tl.setText(text); err != nil {
|
|
return err
|
|
} else if !changed {
|
|
return nil
|
|
}
|
|
|
|
tl.textChangedPublisher.Publish()
|
|
|
|
return nil
|
|
}
|
|
|
|
func (tl *TextLabel) CreateLayoutItem(ctx *LayoutContext) LayoutItem {
|
|
return &textLabelLayoutItem{
|
|
width2Height: make(map[int]int),
|
|
text: tl.Text(),
|
|
font: tl.Font(),
|
|
minWidth: tl.MinSizePixels().Width,
|
|
}
|
|
}
|
|
|
|
type textLabelLayoutItem struct {
|
|
LayoutItemBase
|
|
mutex sync.Mutex
|
|
width2Height map[int]int // in native pixels
|
|
text string
|
|
font *Font
|
|
minWidth int // in native pixels
|
|
}
|
|
|
|
func (*textLabelLayoutItem) LayoutFlags() LayoutFlags {
|
|
return GrowableHorz | GrowableVert
|
|
}
|
|
|
|
func (li *textLabelLayoutItem) IdealSize() Size {
|
|
return li.MinSize()
|
|
}
|
|
|
|
func (li *textLabelLayoutItem) MinSize() Size {
|
|
return calculateTextSize(li.text, li.font, li.ctx.dpi, li.minWidth, li.handle)
|
|
}
|
|
|
|
func (li *textLabelLayoutItem) HasHeightForWidth() bool {
|
|
return true
|
|
}
|
|
|
|
func (li *textLabelLayoutItem) HeightForWidth(width int) int {
|
|
li.mutex.Lock()
|
|
defer li.mutex.Unlock()
|
|
|
|
if height, ok := li.width2Height[width]; ok {
|
|
return height
|
|
}
|
|
|
|
size := calculateTextSize(li.text, li.font, li.ctx.dpi, width, li.handle)
|
|
|
|
li.width2Height[width] = size.Height
|
|
|
|
return size.Height
|
|
}
|