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// 15 july 2014
package ui
import (
"unsafe"
)
// #include "winapi_windows.h"
import "C"
type button struct {
*controlbase
clicked *event
}
var buttonclass = toUTF16("BUTTON")
func startNewButton(text string, style C.DWORD) *button {
c := newControl(buttonclass,
style | C.WS_TABSTOP,
0)
c.setText(text)
C.controlSetControlFont(c.hwnd)
b := &button{
controlbase: c,
clicked: newEvent(),
}
return b
}
func newButton(text string) *button {
b := startNewButton(text, C.BS_PUSHBUTTON)
C.setButtonSubclass(b.hwnd, unsafe.Pointer(b))
b.fpreferredSize = b.buttonpreferredSize
return b
}
func (b *button) OnClicked(e func()) {
b.clicked.set(e)
}
func (b *button) Text() string {
return b.text()
}
func (b *button) SetText(text string) {
b.setText(text)
}
//export buttonClicked
func buttonClicked(data unsafe.Pointer) {
b := (*button)(data)
b.clicked.fire()
println("button clicked")
}
const (
// from http://msdn.microsoft.com/en-us/library/windows/desktop/dn742486.aspx#sizingandspacing
buttonHeight = 14
)
func (b *button) buttonpreferredSize(d *sizing) (width, height int) {
// common controls 6 thankfully provides a method to grab this...
var size C.SIZE
size.cx = 0 // explicitly ask for ideal size
size.cy = 0
if C.SendMessageW(b.hwnd, C.BCM_GETIDEALSIZE, 0, C.LPARAM(uintptr(unsafe.Pointer(&size)))) != C.FALSE {
return int(size.cx), int(size.cy)
}
// that failed, fall back
// don't worry about the error return from GetSystemMetrics(); there's no way to tell (explicitly documented as such)
xmargins := 2 * int(C.GetSystemMetrics(C.SM_CXEDGE))
return xmargins + int(b.textlen), fromdlgunitsY(buttonHeight, d)
}
type checkbox struct {
*button
}
func newCheckbox(text string) *checkbox {
c := &checkbox{
// don't use BS_AUTOCHECKBOX here because it creates problems when refocusing (see http://blogs.msdn.com/b/oldnewthing/archive/2014/05/22/10527522.aspx)
// we'll handle actually toggling the check state ourselves (see controls_windows.c)
button: startNewButton(text, C.BS_CHECKBOX),
}
c.fpreferredSize = c.checkboxpreferredSize
C.setCheckboxSubclass(c.hwnd, unsafe.Pointer(c))
return c
}
func (c *checkbox) Checked() bool {
if C.checkboxChecked(c.hwnd) == C.FALSE {
return false
}
return true
}
func (c *checkbox) SetChecked(checked bool) {
if checked {
C.checkboxSetChecked(c.hwnd, C.TRUE)
return
}
C.checkboxSetChecked(c.hwnd, C.FALSE)
}
//export checkboxToggled
func checkboxToggled(data unsafe.Pointer) {
c := (*checkbox)(data)
c.clicked.fire()
println("checkbox toggled")
}
const (
// from http://msdn.microsoft.com/en-us/library/windows/desktop/dn742486.aspx#sizingandspacing
checkboxHeight = 10
// from http://msdn.microsoft.com/en-us/library/windows/desktop/bb226818%28v=vs.85%29.aspx
checkboxXFromLeftOfBoxToLeftOfLabel = 12
)
func (c *checkbox) checkboxpreferredSize(d *sizing) (width, height int) {
return fromdlgunitsX(checkboxXFromLeftOfBoxToLeftOfLabel, d) + int(c.textlen),
fromdlgunitsY(checkboxHeight, d)
}
type textField struct {
*controlbase
}
var editclass = toUTF16("EDIT")
func startNewTextField(style C.DWORD) *textField {
c := newControl(editclass,
style | C.ES_AUTOHSCROLL | C.ES_LEFT | C.ES_NOHIDESEL | C.WS_TABSTOP,
C.WS_EX_CLIENTEDGE) // WS_EX_CLIENTEDGE without WS_BORDER will show the canonical visual styles border (thanks to MindChild in irc.efnet.net/#winprog)
C.controlSetControlFont(c.hwnd)
t := &textField{
controlbase: c,
}
t.fpreferredSize = t.textfieldpreferredSize
return t
}
func newTextField() *textField {
return startNewTextField(0)
}
func newPasswordField() *textField {
return startNewTextField(C.ES_PASSWORD)
}
func (t *textField) Text() string {
return t.text()
}
func (t *textField) SetText(text string) {
t.setText(text)
}
const (
// from http://msdn.microsoft.com/en-us/library/windows/desktop/dn742486.aspx#sizingandspacing
textfieldWidth = 107 // this is actually the shorter progress bar width, but Microsoft only indicates as wide as necessary
textfieldHeight = 14
)
func (t *textField) textfieldpreferredSize(d *sizing) (width, height int) {
return fromdlgunitsX(textfieldWidth, d), fromdlgunitsY(textfieldHeight, d)
}
type label struct {
*controlbase
standalone bool
supercommitResize func(c *allocation, d *sizing)
}
var labelclass = toUTF16("STATIC")
func finishNewLabel(text string, standalone bool) *label {
c := newControl(labelclass,
// SS_NOPREFIX avoids accelerator translation; SS_LEFTNOWORDWRAP clips text past the end
// controls are vertically aligned to the top by default (thanks Xeek in irc.freenode.net/#winapi)
C.SS_NOPREFIX | C.SS_LEFTNOWORDWRAP,
0)
c.setText(text)
C.controlSetControlFont(c.hwnd)
l := &label{
controlbase: c,
standalone: standalone,
}
l.fpreferredSize = l.labelpreferredSize
l.supercommitResize = l.fcommitResize
l.fcommitResize = l.labelcommitResize
return l
}
func newLabel(text string) Label {
return finishNewLabel(text, false)
}
func newStandaloneLabel(text string) Label {
return finishNewLabel(text, true)
}
func (l *label) Text() string {
return l.text()
}
func (l *label) SetText(text string) {
l.setText(text)
}
const (
// via http://msdn.microsoft.com/en-us/library/windows/desktop/dn742486.aspx#sizingandspacing
labelHeight = 8
labelYOffset = 3
// TODO the label is offset slightly by default...
)
func (l *label) labelpreferredSize(d *sizing) (width, height int) {
return int(l.textlen), fromdlgunitsY(labelHeight, d)
}
func (l *label) labelcommitResize(c *allocation, d *sizing) {
if !l.standalone {
yoff := fromdlgunitsY(labelYOffset, d)
c.y += yoff
c.height -= yoff
}
l.supercommitResize(c, d)
}
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