miqt/examples/mdoutliner/main.go

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package main
import (
"fmt"
"io/ioutil"
"os"
"strings"
"github.com/mappu/miqt/qt"
)
const sampleContent = `# Markdown Outliner
This is sample markdown content.
## Features
- You can use the outline on the left to jump to parts of the document
- Demonstrates use of the MIQT library`
type AppWindow struct {
w *qt.QMainWindow
cw *qt.QWidget
outline *qt.QListWidget
textArea *qt.QTextEdit
}
func NewAppWindow() *AppWindow {
ret := AppWindow{}
ret.w = qt.NewQMainWindow()
ret.w.SetWindowTitle("Markdown Outliner")
// Menu
mnu := qt.NewQMenuBar()
fileMenu := mnu.AddMenuWithTitle("&File")
open := fileMenu.AddAction("Open...")
open.SetShortcut(qt.NewQKeySequence2("Ctrl+O"))
open.OnTriggered1(ret.handleFileOpen)
fileMenu.AddSeparator()
exit := fileMenu.AddAction("Exit")
exit.OnTriggered1(func() {
os.Exit(0)
})
helpMenu := mnu.AddMenuWithTitle("&Help")
aboutQt := helpMenu.AddAction("About Qt")
aboutQt.SetShortcut(qt.NewQKeySequence2("F1"))
aboutQt.OnTriggered1(func() {
qt.QApplication_AboutQt()
})
ret.w.SetMenuBar(mnu)
// Main widgets
ret.cw = qt.NewQWidget2(ret.w.QWidget)
ret.w.SetCentralWidget(ret.cw)
layout := qt.NewQHBoxLayout2(ret.cw)
panes := qt.NewQSplitter()
layout.AddWidget(panes.QWidget)
ret.outline = qt.NewQListWidget2(ret.cw)
panes.AddWidget(ret.outline.QWidget)
ret.outline.OnCurrentItemChanged(ret.handleJumpToBookmark)
ret.textArea = qt.NewQTextEdit3(ret.cw)
ret.textArea.OnTextChanged(ret.handleTextChanged)
ret.textArea.SetText(sampleContent)
panes.AddWidget(ret.textArea.QWidget)
panes.SetSizes([]int{250, 550})
return &ret
}
const lineNumberRole = 0x0100 // Qt::UserDataRole
func (a *AppWindow) handleFileOpen() {
fname := qt.QFileDialog_GetOpenFileName4(a.w.QWidget, "Open markdown file...", "", "Markdown files (*.md *.txt);;All Files (*)")
if fname == "" {
return
}
contents, err := ioutil.ReadFile(fname)
if err != nil {
qt.QMessageBox_Warning(a.w.QWidget, "Failed to open file", fmt.Sprintf("Opening file %q: %v", fname, err))
return
}
a.textArea.SetText(string(contents))
}
func (a *AppWindow) handleTextChanged() {
content := a.textArea.ToPlainText()
a.updateOutlineForContent(content)
}
func (a *AppWindow) updateOutlineForContent(content string) {
a.outline.Clear()
lines := strings.Split(content, "\n")
for lineNumber, line := range lines {
if strings.HasPrefix(line, `#`) {
bookmark := qt.NewQListWidgetItem7(line, a.outline)
bookmark.SetData(lineNumberRole, qt.NewQVariant5(lineNumber))
}
}
}
func (a *AppWindow) handleJumpToBookmark() {
itm := a.outline.CurrentItem()
if itm == nil {
return
}
lineNumber := itm.Data(lineNumberRole).ToInt()
targetBlock := a.textArea.Document().FindBlockByLineNumber(lineNumber)
a.textArea.SetTextCursor(qt.NewQTextCursor4(targetBlock))
a.textArea.SetFocus()
}
func main() {
qt.NewQApplication(os.Args)
app := NewAppWindow()
app.w.Show()
qt.QApplication_Exec()
}