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test

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Irony 2018-07-31 11:36:46 +08:00
parent 09a05cd048
commit b6ca12e05a
1 changed files with 23 additions and 7 deletions
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30
QGraphicsView练习/QGraphicsItem/Item拖拽改变大小.py
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@ -36,7 +36,8 @@ class MoveableItem(QGraphicsRectItem):
# 是否在调整大小的状态 # 是否在调整大小的状态
self.isResizing = False self.isResizing = False
self.prePos = None self.mousePressPos = None
self.mousePressRect = None
def paint(self, painter, option, widget): def paint(self, painter, option, widget):
super(MoveableItem, self).paint(painter, option, widget) super(MoveableItem, self).paint(painter, option, widget)
@ -47,7 +48,8 @@ class MoveableItem(QGraphicsRectItem):
x, y, w, h = rect.x(), rect.y(), rect.width(), rect.height() x, y, w, h = rect.x(), rect.y(), rect.width(), rect.height()
if option.state & QStyle.State_HasFocus: # 有焦点 if option.state & QStyle.State_HasFocus: # 有焦点
painter.setPen(QPen(Qt.red, 3)) # 设置红色画笔 painter.setPen(QPen(Qt.red, 3)) # 设置红色画笔
painter.drawLines( # 在左上、左下、右上、右下画8条小线段 # 在左上、左下、右上、右下、以及四条边上画小线段
painter.drawLines(
QLineF(x, y, x + 10, y), # 左上顶点向右 QLineF(x, y, x + 10, y), # 左上顶点向右
QLineF(x, y, x, y + 10), # 左上顶点向下 QLineF(x, y, x, y + 10), # 左上顶点向下
@ -63,7 +65,7 @@ class MoveableItem(QGraphicsRectItem):
def hoverMoveEvent(self, event): def hoverMoveEvent(self, event):
super(MoveableItem, self).hoverMoveEvent(event) super(MoveableItem, self).hoverMoveEvent(event)
# 鼠标悬停事件 # 鼠标悬停事件,用于检测鼠标位置并改变鼠标形态
cursor = self.isInResizeArea(event.pos()) cursor = self.isInResizeArea(event.pos())
if self.isResizing or (cursor and self.isSelected()): if self.isResizing or (cursor and self.isSelected()):
# 正在调整中或者鼠标在可调整区域范围内并且是选中 # 正在调整中或者鼠标在可调整区域范围内并且是选中
@ -71,25 +73,33 @@ class MoveableItem(QGraphicsRectItem):
else: else:
self.setCursor(Qt.ArrowCursor) self.setCursor(Qt.ArrowCursor)
def hoverLeaveEvent(self, event):
"""鼠标悬停离开事件恢复鼠标样式"""
super(MoveableItem, self).hoverLeaveEvent(event)
self.setCursor(Qt.ArrowCursor)
def mousePressEvent(self, event): def mousePressEvent(self, event):
# 鼠标按下 # 鼠标按下
super(MoveableItem, self).mousePressEvent(event) super(MoveableItem, self).mousePressEvent(event)
if event.button() == Qt.LeftButton and self.isInResizeArea(event.pos()): if event.button() == Qt.LeftButton and self.isInResizeArea(event.pos()):
self.isResizing = True self.isResizing = True
self.prePos = event.pos() self.mousePressPos = event.pos()
self.mousePressRect = self.boundingRect()
def mouseReleaseEvent(self, event): def mouseReleaseEvent(self, event):
# 鼠标释放开 # 鼠标释放开
super(MoveableItem, self).mouseReleaseEvent(event) super(MoveableItem, self).mouseReleaseEvent(event)
if event.button() == Qt.LeftButton and self.isResizing: if event.button() == Qt.LeftButton and self.isResizing:
self.isResizing = False self.isResizing = False
self.prePos = None self.mousePressPos = None
self.mousePressRect = None
self.update()
def mouseMoveEvent(self, event): def mouseMoveEvent(self, event):
# 鼠标移动 # 鼠标移动
if self.isResizing and self.prePos: if self.isResizing and self.mousePressPos:
rect = self.boundingRect() rect = self.boundingRect()
pos = event.pos() - self.prePos pos = event.pos() - self.mousePressPos
w = pos.x() w = pos.x()
h = pos.y() h = pos.y()
x = -4 if w > 0 else 4 x = -4 if w > 0 else 4
@ -115,6 +125,12 @@ class MoveableItem(QGraphicsRectItem):
# 右上角和左下角 # 右上角和左下角
if (rx and ty) or (lx and by): if (rx and ty) or (lx and by):
return Qt.SizeBDiagCursor return Qt.SizeBDiagCursor
# 上、下
if ty or by:
return Qt.SizeVerCursor
if lx or rx:
return Qt.SizeHorCursor
# 左、右
return 0 return 0