LET'S GET THIS FINAL REWRITE EVER STARTED

1 files changed, 71 insertions, 0 deletions

diff --git a/prev/button_windows.go b/prev/button_windows.go
new file mode 100644
index 0000000..ff5a251
--- /dev/null
+++ b/prev/button_windows.go
@@ -0,0 +1,71 @@
+// 15 july 2014
+
+package ui
+
+import (
+	"unsafe"
+)
+
+// #include "winapi_windows.h"
+import "C"
+
+type button struct {
+	*controlSingleHWNDWithText
+	clicked  *event
+}
+
+var buttonclass = toUTF16("BUTTON")
+
+func newButton(text string) *button {
+	hwnd := C.newControl(buttonclass,
+		C.BS_PUSHBUTTON|C.WS_TABSTOP,
+		0)
+	b := &button{
+		controlSingleHWNDWithText:		newControlSingleHWNDWithText(hwnd),
+		clicked: newEvent(),
+	}
+	b.fpreferredSize = b.xpreferredSize
+	b.SetText(text)
+	C.controlSetControlFont(b.hwnd)
+	C.setButtonSubclass(b.hwnd, unsafe.Pointer(b))
+	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()
+}
+
+const (
+	// from http://msdn.microsoft.com/en-us/library/windows/desktop/dn742486.aspx#sizingandspacing
+	buttonHeight = 14
+)
+
+func (b *button) xpreferredSize(d *sizing) (width, height int) {
+	// comctl32.dll version 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
+	println("message failed; falling 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)
+}