Add RichEdit widget and basic demo

Author: whtiehack

README.md

@@ -171,7 +171,7 @@ https://docs.microsoft.com/zh-cn/windows/win32/controls/window-controls
 
 - [x] Spin Control
 
-- [ ] Rich Edit
+- [x] Rich Edit
 
 - [ ] DateTimePicker
 - [ ] Month Calendar

examples/basic/main.go

@@ -71,7 +71,7 @@ func bindWidgets(dlg *wingui.Dialog) {
 	spin, _ := wingui.BindNewSpinControl(IDC_SPIN1, dlg)
 	spinLabel, _ := wingui.BindNewStatic(IDC_SPIN_LABEL, dlg)
 	spin.SetBuddy(spinEdit.Handle())
-	spin.SetRange32(0, 100)
+	spin.SetRange32(-1000, 1000)
 	spin.SetPos32(0)
 	updateSpinLabel := func() {
 		spinLabel.SetText(fmt.Sprintf("Spin: %d", spin.GetPos32()))
@@ -332,6 +332,32 @@ func bindWidgets(dlg *wingui.Dialog) {
 		updateLv2Status()
 	}
 	tabcontrol.AddDialogPage("Page2", tab2)
+
+	// RichEdit demo page
+	richPage, err := wingui.NewDialog(IDD_DIALOG_RICH, tabcontrol.Handle(), nil)
+	if err != nil {
+		log.Println("rich page error", err)
+		return
+	}
+	rich, _ := wingui.BindNewRichEdit(IDC_RICHEDIT1, richPage)
+	richLabel, _ := wingui.BindNewStatic(IDC_RICH_LABEL_LEN, richPage)
+	updateRichLabel := func() {
+		richLabel.SetText(fmt.Sprintf("Len: %d", rich.TextLength()))
+	}
+	updateRichLabel()
+	rich.OnChanged = updateRichLabel
+
+	appendBtn, _ := wingui.BindNewButton(IDC_RICH_APPEND, richPage)
+	appendBtn.OnClicked = func() {
+		rich.AppendText(time.Now().Format("15:04:05") + " hello rich edit\r\n")
+		updateRichLabel()
+	}
+	clearBtn, _ := wingui.BindNewButton(IDC_RICH_CLEAR, richPage)
+	clearBtn.OnClicked = func() {
+		rich.SetText("")
+		updateRichLabel()
+	}
+	tabcontrol.AddDialogPage("RichEdit", richPage)
 	tabcontrol.Select(0)
 	// other
 

examples/basic/resource.h.go

@@ -8,6 +8,7 @@
 #define IDB_BITMAP1                             110
 #define IDB_BITMAP2                             111
 #define IDD_DIALOG_TAB1                         113
+#define IDD_DIALOG_RICH                         114
 #define IDB_OK                                  40000
 #define IDB_CANCEL                              40001
 #define IDC_TAB_LIST1                           40001
@@ -33,3 +34,7 @@
 #define IDC_SPIN_LABEL                          40020
 #define IDC_SPIN_SET42                          40021
 #define IDC_SPIN_RANGE                          40022
+#define IDC_RICHEDIT1                           40023
+#define IDC_RICH_APPEND                         40024
+#define IDC_RICH_CLEAR                          40025
+#define IDC_RICH_LABEL_LEN                      40026

examples/basic/ui.syso

@@ -82,6 +82,18 @@ FONT 8, "Ms Shell Dlg"
     LTEXT           "Count: 0", IDC_TAB_LABEL_COUNT, 7, 76, 141, 9, SS_LEFT, WS_EX_LEFT
 }
 
+LANGUAGE LANG_NEUTRAL, SUBLANG_NEUTRAL
+IDD_DIALOG_RICH DIALOG 0, 0, 153, 86
+STYLE DS_3DLOOK | DS_CENTER | DS_SHELLFONT | WS_VISIBLE | WS_CHILDWINDOW | WS_SYSMENU
+EXSTYLE WS_EX_CLIENTEDGE
+FONT 8, "Ms Shell Dlg"
+{
+    CONTROL         "", IDC_RICHEDIT1, "RICHEDIT50W", WS_TABSTOP | WS_BORDER | ES_MULTILINE | ES_AUTOVSCROLL | ES_WANTRETURN | WS_VSCROLL, 7, 7, 141, 50, WS_EX_LEFT
+    PUSHBUTTON      "Append", IDC_RICH_APPEND, 7, 60, 55, 14, 0, WS_EX_LEFT
+    PUSHBUTTON      "Clear", IDC_RICH_CLEAR, 66, 60, 55, 14, 0, WS_EX_LEFT
+    LTEXT           "Len: 0", IDC_RICH_LABEL_LEN, 7, 76, 141, 9, SS_LEFT, WS_EX_LEFT
+}
+
 
 
 //

examples/basic/ui/resource.h

@@ -0,0 +1,79 @@
+package wingui
+
+import (
+	"syscall"
+	"unsafe"
+
+	"github.com/lxn/win"
+)
+
+// RichEdit is a wrapper for the Win32 Rich Edit control.
+// The class is provided by Msftedit.dll (RICHEDIT50W) or Riched20.dll (RichEdit20W).
+type RichEdit struct {
+	WindowBase
+	OnChanged func()
+}
+
+func (re *RichEdit) WndProc(msg uint32, wParam, lParam uintptr) uintptr {
+	switch msg {
+	case win.WM_COMMAND:
+		switch win.HIWORD(uint32(wParam)) {
+		case win.EN_CHANGE:
+			if re.OnChanged != nil && lParam == uintptr(re.hwnd) {
+				re.OnChanged()
+			}
+		}
+	}
+	return re.AsWindowBase().WndProc(msg, wParam, lParam)
+}
+
+// TextSelection returns the current selection range (character index).
+func (re *RichEdit) TextSelection() (start, end int) {
+	re.SendMessage(win.EM_GETSEL, uintptr(unsafe.Pointer(&start)), uintptr(unsafe.Pointer(&end)))
+	return
+}
+
+// SetTextSelection sets the current selection range (character index).
+func (re *RichEdit) SetTextSelection(start, end int) {
+	re.SendMessage(win.EM_SETSEL, uintptr(start), uintptr(end))
+}
+
+// ReplaceSelectedText replaces the current selection with text.
+func (re *RichEdit) ReplaceSelectedText(text string, canUndo bool) {
+	re.SendMessage(win.EM_REPLACESEL,
+		uintptr(win.BoolToBOOL(canUndo)),
+		uintptr(unsafe.Pointer(syscall.StringToUTF16Ptr(text))),
+	)
+}
+
+// AppendText appends text to the end of the control.
+func (re *RichEdit) AppendText(value string) {
+	s, e := re.TextSelection()
+	l := re.TextLength()
+	re.SetTextSelection(l, l)
+	re.ReplaceSelectedText(value, false)
+	re.SetTextSelection(s, e)
+}
+
+// TextLength returns current text length.
+func (re *RichEdit) TextLength() int {
+	return int(re.SendMessage(win.WM_GETTEXTLENGTH, 0, 0))
+}
+
+// SetReadOnly toggles read-only mode.
+func (re *RichEdit) SetReadOnly(readOnly bool) {
+	re.SendMessage(win.EM_SETREADONLY, uintptr(win.BoolToBOOL(readOnly)), 0)
+}
+
+// NewRichEdit creates a new RichEdit, need bind to Dialog before use.
+func NewRichEdit(idd uintptr) *RichEdit {
+	return &RichEdit{WindowBase: WindowBase{idd: idd}}
+}
+
+// BindNewRichEdit creates a new RichEdit and bind to target dlg.
+func BindNewRichEdit(idd uintptr, dlg *Dialog) (*RichEdit, error) {
+	re := NewRichEdit(idd)
+	err := dlg.BindWidgets(re)
+	return re, err
+}
+

examples/basic/ui/ui.rc

@@ -48,6 +48,7 @@ package wingui
 
 import (
 	"github.com/lxn/win"
+	"golang.org/x/sys/windows"
 	"log"
 	"os"
 	"runtime"
@@ -67,6 +68,9 @@ func init() {
 		DwICC:  win.ICC_WIN95_CLASSES,
 	}
 	win.InitCommonControlsEx(&icc)
+	// Ensure Rich Edit classes are registered (RICHEDIT50W / RichEdit20W).
+	_ = windows.NewLazySystemDLL("Msftedit.dll").Load()
+	_ = windows.NewLazySystemDLL("Riched20.dll").Load()
 }
 
 // InitHInstance init hInstance,used by Dialog APIs.