72 lines
1.6 KiB
Go
72 lines
1.6 KiB
Go
// 15 july 2014
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package ui
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import (
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"unsafe"
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)
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// #include "winapi_windows.h"
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import "C"
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type button struct {
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*controlSingleHWNDWithText
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clicked *event
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}
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var buttonclass = toUTF16("BUTTON")
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func newButton(text string) *button {
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hwnd := C.newControl(buttonclass,
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C.BS_PUSHBUTTON|C.WS_TABSTOP,
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0)
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b := &button{
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controlSingleHWNDWithText: newControlSingleHWNDWithText(hwnd),
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clicked: newEvent(),
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}
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b.fpreferredSize = b.preferredSize
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b.SetText(text)
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C.controlSetControlFont(b.hwnd)
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C.setButtonSubclass(b.hwnd, unsafe.Pointer(b))
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return b
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}
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func (b *button) OnClicked(e func()) {
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b.clicked.set(e)
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}
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func (b *button) Text() string {
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return b.text()
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}
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func (b *button) SetText(text string) {
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b.setText(text)
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}
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//export buttonClicked
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func buttonClicked(data unsafe.Pointer) {
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b := (*button)(data)
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b.clicked.fire()
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}
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const (
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// from http://msdn.microsoft.com/en-us/library/windows/desktop/dn742486.aspx#sizingandspacing
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buttonHeight = 14
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)
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func (b *button) preferredSize(d *sizing) (width, height int) {
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// comctl32.dll version 6 thankfully provides a method to grab this...
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var size C.SIZE
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size.cx = 0 // explicitly ask for ideal size
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size.cy = 0
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if C.SendMessageW(b.hwnd, C.BCM_GETIDEALSIZE, 0, C.LPARAM(uintptr(unsafe.Pointer(&size)))) != C.FALSE {
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return int(size.cx), int(size.cy)
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}
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// that failed, fall back
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println("message failed; falling back")
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// don't worry about the error return from GetSystemMetrics(); there's no way to tell (explicitly documented as such)
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xmargins := 2 * int(C.GetSystemMetrics(C.SM_CXEDGE))
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return xmargins + int(b.textlen), fromdlgunitsY(buttonHeight, d)
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}
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