用户对问题“在paintEvent中绘制时出现Qt问题的Golang”的回答

paintEventpainter := gui.NewQPainter2(ce.editor)

QWidget::paintEngine: Should no longer be called
QPainter::begin: Paint device returned engine == 0, type: 1

setPen

QPainter::setPen: Painter未激活

下面是这个问题的一个工作示例

package main


import (
    "os"

    "github.com/therecipe/qt/widgets"
    "github.com/therecipe/qt/gui"
    "github.com/therecipe/qt/core"
)

type CodeEditor struct {
    editor *widgets.QPlainTextEdit
}

func NewCodeEditor(parent *widgets.QWidget) *CodeEditor {
    codeEditor := &CodeEditor{editor: widgets.NewQPlainTextEdit(parent)}
    codeEditor.setupSignals()
    return codeEditor
}

func (ce *CodeEditor) setupSignals() {
    ce.editor.ConnectPaintEvent(ce.paintEvent)
}

func (ce *CodeEditor) paintEvent(event *gui.QPaintEvent) {
    painter := gui.NewQPainter2(ce.editor)
    color := gui.NewQColor6("red")
    painter.SetPen2(color)
    painter.DestroyQPainter()
}

func main() {
    core.QCoreApplication_SetAttribute(core.Qt__AA_ShareOpenGLContexts, true)
    widgets.NewQApplication(len(os.Args), os.Args)

    mainWindow := widgets.NewQMainWindow(nil, 0)
    codeEditor := NewCodeEditor(nil)

    mainWindow.SetCentralWidget(codeEditor.editor)
    mainWindow.ShowMaximized()

    widgets.QApplication_Exec()
}