无法通过鼠标单击移动 QGraphicsRectItem

Posted 2023-02-14

【中文标题】无法通过鼠标单击移动 QGraphicsRectItem

【英文标题】：Unable to move a QGraphicsRectItem with mouse click

【发布时间】：2017-07-02 10:58:11

【问题描述】：

我的 QGraphicsRectItem() 定义如下

def create_blocks(self):
    """
    Creates block rectangles and adds them to scene.
    """
    for i in range(self.nrows):
        line_block = []
        for j in range(self.ncols):
            block = QGraphicsRectItem(0, 0, 100, 100)
            block.setPos(j * 100, i * 100)
            self.scene.addItem(block)
            line_block.append(block)
        self.block_array.append(line_block)

这些矩形项的填写方式如下：

def fillData(self):
    """
    Fill puzzle blocks with numbers and remove SPACER block.
    Fills puzzle block with color - zigzag
    """
    color1 = Qt.lightGray
    color2 = Qt.gray
    last_color = color1
    color_table = 

    # generate dict with color for each number (1-lgray, 2-gray, 3-lgray, etc.)
    keys = xrange(1, 16)
    for key in keys:
        color_table[key] = last_color
        last_color = color1 if last_color == color2 else color2

    for j in range(self.ncols):
        for i in range(self.nrows):
            block = self.block_array[i][j]
            blockBoundRect = block.boundingRect()
            block.mousePressEvent(Qt.LeftButton)
            num = self.init_data[i][j]
            if num == self.SPACER:
                self.scene.removeItem(block)
                continue
            else:
                text = str(num)
                block.setBrush(QColor(color_table[num]))

            textItem = QGraphicsSimpleTextItem(text, block)
            font = textItem.font()
            font.setPixelSize(50)
            textItem.setFont(font)
            textItemBoundRect = textItem.boundingRect()
            new_x = blockBoundRect.width() / 2.0 - textItemBoundRect.width() / 2.0
            new_y = blockBoundRect.height() / 2.0 - textItemBoundRect.height() / 2.0
            textItem.setPos(new_x, new_y)

block.mousePressEvent(Qt.LeftButton)

通过这一行，我试图启用对矩形的点击，但我现在无法这样做。我需要有人帮助指出我在哪里编写逻辑，如果单击按钮并在空白位置旁边移动矩形。

我正在尝试用 python 制作一个 15 益智游戏，我已经将后端代码连接到 GUI 并且求解器部分工作正常。我之前没有 QT 的经验，我基本上是一个 python 脚本编写者。

【参考方案1】：

您应该在项目创建后设置这些标志：

block.setFlag(QtGui.QGraphicsItem.ItemIsMovable, True)
block.setFlag(QtGui.QGraphicsItem.ItemIsSelectable, True)