Native windows open file dialog

editor.go

@@ -109,7 +109,10 @@ func (e *Editor) UpdateAndDraw(drawStartPos, winSize *imgui.Vec2, newRunes []run
 	imgui.PushStyleColorVec4(imgui.ColTextSelectedBg, settings.TextSelectionColor)
 
 	imgui.SetNextItemWidth(winSize.X)
-	if imgui.InputTextMultiline("", &e.FileContents, imgui.Vec2{X: winSize.X - winSize.X*0.02, Y: winSize.Y - winSize.Y*0.02}, imgui.InputTextFlagsNone, nil) {
+
+	// We want different lables so multiple editors don't mess eaach other, but we don't want the label to show
+	// so we prefix the whole thing with ##
+	if imgui.InputTextMultiline("##"+e.FilePath, &e.FileContents, imgui.Vec2{X: winSize.X - winSize.X*0.02, Y: winSize.Y - winSize.Y*0.02}, imgui.InputTextFlagsNone|imgui.InputTextFlagsAllowTabInput, nil) {
 		e.IsModified = true
 	}
 

file_dialogs_windows.go

@@ -0,0 +1,71 @@
+package main
+
+import (
+	"fmt"
+	"syscall"
+	"unicode/utf16"
+	"unsafe"
+)
+
+var (
+	comdlg32            = syscall.NewLazyDLL("Comdlg32.dll")
+	procGetOpenFileName = comdlg32.NewProc("GetOpenFileNameW")
+)
+
+var (
+	Err_No_File_Chosen = fmt.Errorf("no file was chosen")
+)
+
+func OpenFileDialog(title string) (filepath string, err error) {
+
+	type OPENFILENAMEW struct {
+		LStructSize   uint32
+		HwndOwner     syscall.Handle
+		HInstance     syscall.Handle
+		Filter        *uint16
+		CustomFilter  *uint16
+		MaxCustFilter uint32
+		FilterIndex   uint32
+		File          *uint16
+		MaxFile       uint32
+		FileTitle     *uint16
+		MaxFileTitle  uint32
+		InitialDir    *uint16
+		Title         *uint16
+		Flags         uint32
+		FileOffset    uint16
+		FileExtension uint16
+		DefExt        *uint16
+		CustData      uintptr
+		FnHook        syscall.Handle
+		TemplateName  *uint16
+		PvReserved    uintptr
+		DwReserved    uint32
+		FlagsEx       uint32
+	}
+
+	titleByteArr := utf16.Encode([]rune(title + "\x00"))
+	filterByteArr := utf16.Encode([]rune("All Files (*.*)\x00*.*\x00Text Files (*.txt)\x00*.txt\x00\x00"))
+
+	filenameByteArr := make([]uint16, syscall.MAX_LONG_PATH)
+
+	ofn := &OPENFILENAMEW{
+		HwndOwner:   0,
+		HInstance:   0,
+		LStructSize: uint32(unsafe.Sizeof(OPENFILENAMEW{})),
+		Title:       &titleByteArr[0],
+		Filter:      &filterByteArr[0],
+		File:        &filenameByteArr[0],
+		MaxFile:     syscall.MAX_LONG_PATH,
+		// OFN_FILEMUSTEXIST
+		Flags: 0x00001000,
+	}
+
+	ret, _, _ := procGetOpenFileName.Call(uintptr(unsafe.Pointer(ofn)))
+	if ret == 0 {
+		return "", Err_No_File_Chosen
+	}
+
+	filepath = syscall.UTF16ToString(filenameByteArr)
+	return filepath, nil
+}

main.go

@@ -16,7 +16,9 @@ import (
 	"github.com/veandco/go-sdl2/sdl"
 )
 
-//TODO: Cache os.ReadDir so we don't have to use lots of disk
+// @TODO:
+// - Cache os.ReadDir so we don't have to use lots of disk
+// - Seems undo is broken
 
 type Gopad struct {
 	Win       *engine.Window
@@ -85,7 +87,7 @@ func main() {
 	// so we do it here
 	g.LoadFonts()
 
-	// engine.SetVSync(true)
+	engine.SetVSync(true)
 	engine.Run(&g, g.Win, g.ImGUIInfo)
 }
 
@@ -171,6 +173,18 @@ func (g *Gopad) Update() {
 		g.showErrorPopup()
 	}
 
+	if input.KeyDownCaptured(sdl.K_LCTRL) && input.KeyClickedCaptured(sdl.K_o) {
+
+		filepath, err := OpenFileDialog("Open")
+		if err != nil && err != Err_No_File_Chosen {
+			g.triggerError(err.Error())
+		}
+
+		if err == nil {
+			g.loadFileFromPath(filepath)
+		}
+	}
+
 	if input.MouseClickedCaptued(sdl.BUTTON_LEFT) {
 		x, y := input.GetMousePos()
 		g.getActiveEditor().SetCursorPos(int(x), int(y))
@@ -189,15 +203,11 @@ func (g *Gopad) Update() {
 	e := g.getActiveEditor()
 
 	//Save if needed
-	if !e.IsModified {
+	if e.IsModified {
-		return
+		if input.KeyDownCaptured(sdl.K_LCTRL) && input.KeyClickedCaptured(sdl.K_s) {
+			g.saveEditor(e)
+		}
 	}
-
-	if !input.KeyDownCaptured(sdl.K_LCTRL) || !input.KeyClickedCaptured(sdl.K_s) {
-		return
-	}
-
-	g.saveEditor(e)
 }
 
 func (g *Gopad) saveEditor(e *Editor) {
@@ -406,11 +416,11 @@ func (g *Gopad) drawDir(dir fs.DirEntry, path string) {
 func (g *Gopad) drawFile(f fs.DirEntry, path string) {
 
 	if imgui.Button(f.Name()) {
-		g.handleFileClick(path)
+		g.loadFileFromPath(path)
 	}
 }
 
-func (g *Gopad) handleFileClick(fPath string) {
+func (g *Gopad) loadFileFromPath(fPath string) {
 
 	//Check if we already have the file open
 	editorIndex := -1
@@ -432,11 +442,13 @@ func (g *Gopad) handleFileClick(fPath string) {
 	//Read new file and switch to it
 	e := NewEditor(fPath)
 	e.RefreshFontSettings()
+
 	g.editors = append(g.editors, e)
 	g.activeEditor = len(g.editors) - 1
 }
 
 func (g *Gopad) FrameEnd() {
+
 	g.newRunes = []rune{}
 
 	// Close editors if needed