Question

这部法典用一个工具路障和一个QTextEdit地区运行一个很小的窗口。

如果你强调香蕉和改变老体大小,那么使用 tool子或CTRL+湿轮只会使 app体变。任何人都知道为什么?

from PySide import QtGui, QtCore

class MainWindow(QtGui.QMainWindow):
    def __init__(self, parent=None):
        super(MainWindow, self).__init__(parent)
        self.textEdit = Editor(self)
        self.toolBar  = QtGui.QToolBar(self)
        self.addToolBar(self.toolBar)
        self.setCentralWidget(self.textEdit)
        self.textEdit.setHtml( <font color=blue>apples bananas</font> )

        # Zoom
        self.actionZoomIn  = QtGui.QAction( Zoom In ,  self)
        self.actionZoomOut = QtGui.QAction( Zoom Out , self)
        self.toolBar.addAction(self.actionZoomIn)
        self.toolBar.addAction(self.actionZoomOut)
        self.actionZoomIn.triggered.connect(self.onZoomInClicked)
        self.actionZoomOut.triggered.connect(self.onZoomOutClicked)

        # Font Size
        self.comboSize = QtGui.QComboBox(self.toolBar)
        self.toolBar.addWidget(self.comboSize)
        self.comboSize.addItem( 0 )
        self.comboSize.addItem( 10 )
        self.comboSize.addItem( 18 )
        self.comboSize.addItem( 30 )
        self.comboSize.addItem( 48 )
        self.comboSize.setCurrentIndex(1)
        self.comboSize.activated[str].connect(self.textSize)

    def textSize(self, pointSize):
        pointSize = int(pointSize)
        if pointSize > 0:
            fmt = QtGui.QTextCharFormat()
            fmt.setFontPointSize(pointSize)
            self.mergeFormatOnWordOrSelection(fmt)

    def mergeFormatOnWordOrSelection(self, format):
        cursor = self.textEdit.textCursor()
        if not cursor.hasSelection():
            cursor.select(QtGui.QTextCursor.WordUnderCursor)

        cursor.mergeCharFormat(format)
        self.textEdit.mergeCurrentCharFormat(format)

    def onZoomInClicked(self):
        self.textEdit.zoom(+1)

    def onZoomOutClicked(self):
        self.textEdit.zoom(-1)

class Editor(QtGui.QTextEdit):
    def __init__(self, parent=None):
        super(Editor, self).__init__(parent)
        self.zoomValue = 0

    def zoom(self, delta):
        zoomIncrement = 3

        if delta < 0:
            zoomIncrement = 0 - zoomIncrement

        self.zoomIn(zoomIncrement)
        self.zoomValue = self.zoomValue + zoomIncrement

        print "self.zoomValue", self.zoomValue

    def wheelEvent(self, event):
        if (event.modifiers() & QtCore.Qt.ControlModifier):
            self.zoom(event.delta())

if __name__ ==  __main__ :
    app = QtGui.QApplication([])
    window = MainWindow()
    window.resize(400, 180)
    window.show()
    app.exec_()

Answer 1

<代码>QTextEdit.zoomIn/Out的违约执行只是修改文本编辑的基字体的<代码>。

改用字体尺寸的计算方法是在<条码>中选用字标/代码>,并使用线标,将<条码>font-size 财产定值。这意味着,在案文编辑之后,只有未改动的案文才会受到影响。

通过使用相对体积来解决这一问题。然而,它只看一个温和的子集:csss nature得到了支持,因此它唯一可能设定诸如small、large等不准确的数值。

可以通过作出以下修改来实施:

    # Font Size
    self.comboSize = QtGui.QComboBox(self.toolBar)
    self.toolBar.addWidget(self.comboSize)
    self.comboSize.addItem( small )
    self.comboSize.addItem( medium )
    self.comboSize.addItem( large )
    self.comboSize.addItem( x-large )
    self.comboSize.addItem( xx-large )
    self.comboSize.setCurrentIndex(1)
    self.comboSize.activated[int].connect(self.textSize)

def textSize(self, size):
    fmt = QtGui.QTextCharFormat()
    fmt.setProperty(QtGui.QTextFormat.FontSizeAdjustment, size - 1)
    self.mergeFormatOnWordOrSelection(fmt)

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