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widget.go
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widget.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/lxn/win"
)
// LayoutFlags specify how a Widget wants to be treated when used with a Layout.
//
// These flags are interpreted in respect to Widget.SizeHint.
type LayoutFlags byte
const (
// ShrinkableHorz allows a Widget to be shrunk horizontally.
ShrinkableHorz LayoutFlags = 1 << iota
// ShrinkableVert allows a Widget to be shrunk vertically.
ShrinkableVert
// GrowableHorz allows a Widget to be enlarged horizontally.
GrowableHorz
// GrowableVert allows a Widget to be enlarged vertically.
GrowableVert
// GreedyHorz specifies that the widget prefers to take up as much space as
// possible, horizontally.
GreedyHorz
// GreedyVert specifies that the widget prefers to take up as much space as
// possible, vertically.
GreedyVert
)
type Widget interface {
Window
// AsWidgetBase returns a *WidgetBase that implements Widget.
AsWidgetBase() *WidgetBase
// Form returns the root ancestor Form of the Widget.
Form() Form
// LayoutFlags returns a combination of LayoutFlags that specify how the
// Widget wants to be treated by Layout implementations.
LayoutFlags() LayoutFlags
// MinSizeHint returns the minimum outer Size, including decorations, that
// makes sense for the respective type of Widget.
MinSizeHint() Size
// Parent returns the Container of the Widget.
Parent() Container
// SetParent sets the parent of the Widget and adds the Widget to the
// Children list of the Container.
SetParent(value Container) error
// SetToolTipText sets the tool tip text of the Widget.
SetToolTipText(s string) error
// SizeHint returns the preferred Size for the respective type of Widget.
SizeHint() Size
// ToolTipText returns the tool tip text of the Widget.
ToolTipText() string
}
type WidgetBase struct {
WindowBase
parent Container
toolTipTextProperty Property
toolTipTextChangedPublisher EventPublisher
}
// InitWidget initializes a Widget.
func InitWidget(widget Widget, parent Window, className string, style, exStyle uint32) error {
if parent == nil {
return newError("parent cannot be nil")
}
if err := InitWindow(widget, parent, className, style|win.WS_CHILD, exStyle); err != nil {
return err
}
if container, ok := parent.(Container); ok {
if container.Children() == nil {
// Required by parents like MainWindow and GroupBox.
if win.SetParent(widget.Handle(), container.Handle()) == 0 {
return lastError("SetParent")
}
} else {
if err := container.Children().Add(widget); err != nil {
return err
}
}
}
return nil
}
func (wb *WidgetBase) init(widget Widget) error {
if _, ok := widget.(*ToolTip); !ok {
if err := globalToolTip.AddTool(wb); err != nil {
return err
}
}
wb.toolTipTextProperty = NewProperty(
func() interface{} {
return wb.window.(Widget).ToolTipText()
},
func(v interface{}) error {
wb.window.(Widget).SetToolTipText(v.(string))
return nil
},
wb.toolTipTextChangedPublisher.Event())
wb.MustRegisterProperty("ToolTipText", wb.toolTipTextProperty)
return nil
}
// AsWidgetBase just returns the receiver.
func (wb *WidgetBase) AsWidgetBase() *WidgetBase {
return wb
}
// Bounds returns the outer bounding box Rectangle of the WidgetBase, including
// decorations.
//
// The coordinates are relative to the parent of the Widget.
func (wb *WidgetBase) Bounds() Rectangle {
b := wb.WindowBase.Bounds()
if wb.parent != nil {
p := win.POINT{int32(b.X), int32(b.Y)}
if !win.ScreenToClient(wb.parent.Handle(), &p) {
newError("ScreenToClient failed")
return Rectangle{}
}
b.X = int(p.X)
b.Y = int(p.Y)
}
return b
}
// BringToTop moves the WidgetBase to the top of the keyboard focus order.
func (wb *WidgetBase) BringToTop() error {
if wb.parent != nil {
if err := wb.parent.BringToTop(); err != nil {
return err
}
}
return wb.WindowBase.BringToTop()
}
// Enabled returns if the WidgetBase is enabled for user interaction.
func (wb *WidgetBase) Enabled() bool {
if wb.parent != nil {
return wb.enabled && wb.parent.Enabled()
}
return wb.enabled
}
// Font returns the Font of the WidgetBase.
//
// By default this is a MS Shell Dlg 2, 8 point font.
func (wb *WidgetBase) Font() *Font {
if wb.font != nil {
return wb.font
} else if wb.parent != nil {
return wb.parent.Font()
}
return defaultFont
}
// Form returns the root ancestor Form of the Widget.
func (wb *WidgetBase) Form() Form {
return ancestor(wb)
}
// LayoutFlags returns a combination of LayoutFlags that specify how the
// WidgetBase wants to be treated by Layout implementations.
func (wb *WidgetBase) LayoutFlags() LayoutFlags {
return 0
}
// MinSizeHint returns the minimum outer Size, including decorations, that
// makes sense for the respective type of Widget.
func (wb *WidgetBase) MinSizeHint() Size {
return Size{10, 10}
}
// Parent returns the Container of the WidgetBase.
func (wb *WidgetBase) Parent() Container {
return wb.parent
}
// SetParent sets the parent of the WidgetBase and adds the WidgetBase to the
// Children list of the Container.
func (wb *WidgetBase) SetParent(parent Container) (err error) {
if parent == wb.parent {
return nil
}
style := uint32(win.GetWindowLong(wb.hWnd, win.GWL_STYLE))
if style == 0 {
return lastError("GetWindowLong")
}
if parent == nil {
style &^= win.WS_CHILD
style |= win.WS_POPUP
if win.SetParent(wb.hWnd, 0) == 0 {
return lastError("SetParent")
}
win.SetLastError(0)
if win.SetWindowLong(wb.hWnd, win.GWL_STYLE, int32(style)) == 0 {
return lastError("SetWindowLong")
}
} else {
style |= win.WS_CHILD
style &^= win.WS_POPUP
win.SetLastError(0)
if win.SetWindowLong(wb.hWnd, win.GWL_STYLE, int32(style)) == 0 {
return lastError("SetWindowLong")
}
if win.SetParent(wb.hWnd, parent.Handle()) == 0 {
return lastError("SetParent")
}
}
b := wb.Bounds()
if !win.SetWindowPos(
wb.hWnd,
win.HWND_BOTTOM,
int32(b.X),
int32(b.Y),
int32(b.Width),
int32(b.Height),
win.SWP_FRAMECHANGED) {
return lastError("SetWindowPos")
}
oldParent := wb.parent
wb.parent = parent
var oldChildren, newChildren *WidgetList
if oldParent != nil {
oldChildren = oldParent.Children()
}
if parent != nil {
newChildren = parent.Children()
}
if newChildren == oldChildren {
return nil
}
widget := wb.window.(Widget)
if oldChildren != nil {
oldChildren.Remove(widget)
}
if newChildren != nil && !newChildren.containsHandle(wb.hWnd) {
newChildren.Add(widget)
}
return nil
}
// SizeHint returns a default Size that should be "overidden" by a concrete
// Widget type.
func (wb *WidgetBase) SizeHint() Size {
return wb.window.(Widget).MinSizeHint()
}
// ToolTipText returns the tool tip text of the WidgetBase.
func (wb *WidgetBase) ToolTipText() string {
return globalToolTip.Text(wb.window.(Widget))
}
// SetToolTipText sets the tool tip text of the WidgetBase.
func (wb *WidgetBase) SetToolTipText(s string) error {
if err := globalToolTip.SetText(wb.window.(Widget), s); err != nil {
return err
}
wb.toolTipTextChangedPublisher.Publish()
return nil
}
func (wb *WidgetBase) updateParentLayout() error {
if wb.parent == nil || wb.parent.Layout() == nil || wb.parent.Suspended() {
return nil
}
return wb.parent.Layout().Update(false)
}
func ancestor(w Widget) Form {
if w == nil {
return nil
}
hWndRoot := win.GetAncestor(w.Handle(), win.GA_ROOT)
rw, _ := windowFromHandle(hWndRoot).(Form)
return rw
}
func minSizeEffective(w Widget) Size {
return maxSize(w.MinSize(), w.MinSizeHint())
}