From a8bd21fe9598354771da6a4d7c3dd253d44fb721 Mon Sep 17 00:00:00 2001
From: Pietro Gagliardi <pietro10@mac.com>
Date: Tue, 25 Feb 2014 08:28:10 -0500
Subject: [PATCH] Added Windows implementation of ProgressBar and the requisite
 comctl32.dll code.

---
 comctl_windows.go  | 86 ++++++++++++++++++++++++++++++++++++++++++++++
 common_windows.go  |  1 +
 init_windows.go    |  4 +++
 sysdata_windows.go |  2 +-
 4 files changed, 92 insertions(+), 1 deletion(-)
 create mode 100644 comctl_windows.go

diff --git a/comctl_windows.go b/comctl_windows.go
new file mode 100644
index 0000000..6c472e8
--- /dev/null
+++ b/comctl_windows.go
@@ -0,0 +1,86 @@
+// 25 february 2014
+package ui
+
+import (
+	"fmt"
+//	"syscall"
+	"unsafe"
+)
+
+// pretty much every constant here except _WM_USER is from commctrl.h
+// TODO for all: filter out constants not available in Windows 2000
+
+// InitCommonControlsEx constants.
+const (
+	_ICC_LISTVIEW_CLASSES = 0x00000001
+	_ICC_TREEVIEW_CLASSES = 0x00000002
+	_ICC_BAR_CLASSES = 0x00000004
+	_ICC_TAB_CLASSES = 0x00000008
+	_ICC_UPDOWN_CLASS = 0x00000010
+	_ICC_PROGRESS_CLASS = 0x00000020
+	_ICC_HOTKEY_CLASS = 0x00000040
+	_ICC_ANIMATE_CLASS = 0x00000080
+	_ICC_WIN95_CLASSES = 0x000000FF
+	_ICC_DATE_CLASSES = 0x00000100
+	_ICC_USEREX_CLASSES = 0x00000200
+	_ICC_COOL_CLASSES = 0x00000400
+	_ICC_INTERNET_CLASSES = 0x00000800
+	_ICC_PAGESCROLLER_CLASS = 0x00001000
+	_ICC_NATIVEFNTCTL_CLASS = 0x00002000
+	_ICC_STANDARD_CLASSES = 0x00004000
+	_ICC_LINK_CLASS = 0x00008000
+)
+
+var (
+	_initCommonControlsEx = comctl32.NewProc("InitCommonControlsEx")
+)
+
+func initCommonControls() (err error) {
+	var icc struct {
+		dwSize	uint32
+		dwICC	uint32
+	}
+
+	icc.dwSize = uint32(unsafe.Sizeof(icc))
+	icc.dwICC = _ICC_PROGRESS_CLASS
+	r1, _, err := _initCommonControlsEx.Call(uintptr(unsafe.Pointer(&icc)))
+	if r1 == _FALSE {		// failure
+		// TODO does it set GetLastError()?
+		return fmt.Errorf("error initializing Common Controls (comctl32.dll): %v", err)
+	}
+	return nil
+}
+
+// Common Controls class names.
+const (
+	_PROGRESS_CLASS = "msctls_progress32"
+)
+
+// Shared Common Controls styles.
+const (
+	_WM_USER = 0x0400
+	_CCM_FIRST = 0x2000
+	_CCM_SETBKCOLOR = (_CCM_FIRST + 1)
+)
+
+// TODO move _WM_USER here?
+
+// Progress Bar styles.
+const (
+	_PBS_SMOOTH = 0x01
+	_PBS_VERTICAL = 0x04
+)
+
+// Progress Bar messages.
+const (
+	_PBM_SETRANGE = (_WM_USER + 1)
+	_PBM_SETPOS = (_WM_USER + 2)
+	_PBM_DELTAPOS = (_WM_USER + 3)
+	_PBM_SETSTEP = (_WM_USER + 4)
+	_PBM_STEPIT = (_WM_USER + 5)
+	_PBM_SETRANGE32 = (_WM_USER + 6)
+	_PBM_GETRANGE = (_WM_USER + 7)
+	_PBM_GETPOS = (_WM_USER + 8)
+	_PBM_SETBARCOLOR = (_WM_USER + 9)
+	_PBM_SETBKCOLOR = _CCM_SETBKCOLOR
+)
diff --git a/common_windows.go b/common_windows.go
index 029bef3..cb6d2a3 100644
--- a/common_windows.go
+++ b/common_windows.go
@@ -10,6 +10,7 @@ var (
 	user32 = syscall.NewLazyDLL("user32.dll")
 	kernel32 = syscall.NewLazyDLL("kernel32.dll")
 	gdi32 = syscall.NewLazyDLL("gdi32.dll")
+	comctl32 = syscall.NewLazyDLL("comctl32.dll")
 )
 
 type _HANDLE uintptr
diff --git a/init_windows.go b/init_windows.go
index eaf4816..fdd28bb 100644
--- a/init_windows.go
+++ b/init_windows.go
@@ -70,6 +70,10 @@ func doWindowsInit() (err error) {
 	if err != nil {
 		return fmt.Errorf("error getting standard window fonts: %v", err)
 	}
+	err = initCommonControls()
+	if err != nil {
+		return fmt.Errorf("error initializing Common Controls (comctl32.dll): %v", err)
+	}
 	// TODO others
 	return nil		// all ready to go
 }
diff --git a/sysdata_windows.go b/sysdata_windows.go
index cd5d8c8..81a2d11 100644
--- a/sysdata_windows.go
+++ b/sysdata_windows.go
@@ -93,7 +93,7 @@ var classTypes = [nctypes]*classData{
 		addSpaceErr:		_LB_ERRSPACE,
 	},
 	c_progressbar:		&classData{
-		name:			XXXXX,
+		name:			_PROGRESS_CLASS,
 		style:			_PBS_SMOOTH | controlstyle,
 		xstyle:			0 | controlxstyle,
 	},