def paintEvent(self, ev):
offset = QPoint(0, 0)
p = QPainter(self)
p.setClipRect(ev.rect())
bottom = self.rect().bottom()
if self.results:
for i, (prefix, full, text) in enumerate(self.results):
size = prefix.size()
if offset.y() + size.height() > bottom:
break
self.max_result = i
offset.setX(0)
if i in (self.current_result, self.mouse_hover_result):
p.save()
if i != self.current_result:
p.setPen(Qt.PenStyle.DotLine)
p.drawLine(offset, QPoint(self.width(), offset.y()))
p.restore()
offset.setY(offset.y() + self.MARGIN // 2)
p.drawStaticText(offset, prefix)
offset.setX(self.maxwidth + 5)
p.drawStaticText(offset, self.divider)
offset.setX(offset.x() + self.divider.size().width())
p.drawStaticText(offset, full)
offset.setY(offset.y() + size.height() + self.MARGIN // 2)
if i in (self.current_result, self.mouse_hover_result):
offset.setX(0)
p.save()
if i != self.current_result:
p.setPen(Qt.PenStyle.DotLine)
p.drawLine(offset, QPoint(self.width(), offset.y()))
p.restore()
else:
p.drawText(self.rect(), Qt.AlignmentFlag.AlignCenter,
_('No results found'))
p.end()
def paintEvent(self, ev):
offset = QPoint(0, 0)
p = QPainter(self)
p.setClipRect(ev.rect())
bottom = self.rect().bottom()
if self.results:
for i, (prefix, full, text) in enumerate(self.results):
size = prefix.size()
if offset.y() + size.height() > bottom:
break
self.max_result = i
offset.setX(0)
if i in (self.current_result, self.mouse_hover_result):
p.save()
if i != self.current_result:
p.setPen(Qt.DotLine)
p.drawLine(offset, QPoint(self.width(), offset.y()))
p.restore()
offset.setY(offset.y() + self.MARGIN // 2)
p.drawStaticText(offset, prefix)
offset.setX(self.maxwidth + 5)
p.drawStaticText(offset, self.divider)
offset.setX(offset.x() + self.divider.size().width())
p.drawStaticText(offset, full)
offset.setY(offset.y() + size.height() + self.MARGIN // 2)
if i in (self.current_result, self.mouse_hover_result):
offset.setX(0)
p.save()
if i != self.current_result:
p.setPen(Qt.DotLine)
p.drawLine(offset, QPoint(self.width(), offset.y()))
p.restore()
else:
p.drawText(self.rect(), Qt.AlignCenter, _('No results found'))
p.end()
class PaintBoard(QWidget):
def __init__(self, parent=None):
super().__init__(parent)
self.__size = QSize(350, 350)
# 新建画板，尺寸为__size
self.__board = QPixmap(self.__size)
self.__board.fill(Qt.white) # 用白色填充画板
self.__painter = QPainter() # 新建绘图工具
self.eraser_mode = False # 默认为禁用橡皮擦模式
self.__thickness = 6 # 默认画笔粗细为10px
self.__lastPos = QPoint(0, 0) # 上一次鼠标位置
self.__currentPos = QPoint(0, 0) # 当前的鼠标位置
self.__undo_num = 0
self.__redo_num = 0
self.__undo_list = []
self.__redo_list = []
self.__undo_list.append(self.__board.toImage())
# 设置界面的尺寸为__size
self.setFixedSize(self.__size)
def clear(self):
self.__board.fill(Qt.white)
# 清空画板
self.update()
self.__undo_list.append(self.__board.toImage())
self.__redo_list = []
self.__undo_num += 1
self.__redo_num = 0
def up(self, image):
self.__board = image
# 清空画板
self.update()
self.__undo_list.append(self.__board.toImage())
self.__redo_list = []
self.__undo_num += 1
self.__redo_num = 0
def undo(self):
if self.__undo_num > 0:
image = self.__undo_list[self.__undo_num - 1]
self.__board = QPixmap.fromImage(image)
self.update()
self.__redo_list.append(self.__undo_list.pop())
self.__redo_num += 1
self.__undo_num -= 1
def redo(self):
if self.__redo_num > 0:
image = self.__redo_list[self.__redo_num - 1]
self.__board = QPixmap(image)
self.update()
self.__undo_list.append(self.__redo_list.pop())
self.__redo_num -= 1
self.__undo_num += 1
def change_pen_thickness(self, thickness=10):
# 改变画笔粗细
self.__thickness = thickness
def get_content_as_image(self):
# 获取画板内容（返回QImage）
image = self.__board.toImage()
return image
def paintEvent(self, paint_event):
# 绘图事件
# 绘图时必须使用QPainter的实例，此处为__painter
# 绘图在begin()函数与end()函数间进行
# begin(param)的参数要指定绘图设备，即把图画在哪里
self.__painter.begin(self)
# 0,0为绘图的左上角起点的坐标，__board即要绘制的图
self.__painter.drawPixmap(0, 0, self.__board)
self.__painter.end()
def mouse_press_event(self, mouse_event):
# 鼠标按下时，获取鼠标的当前位置保存为上一次位置
# self.__currentPos = mouse_event.pos()
self.__currentPos.setX(mouse_event.pos().x() - 803)
self.__currentPos.setY(mouse_event.pos().y() - 147)
self.__lastPos = self.__currentPos
def mouse_move_event(self, mouse_event):
# self.__currentPos = mouse_event.pos()
# 鼠标移动时，更新当前位置，并在上一个位置和当前位置间画线
self.__currentPos.setX(mouse_event.pos().x() - 803)
self.__currentPos.setY(mouse_event.pos().y() - 147)
self.__painter.begin(self.__board)
if not self.eraser_mode:
# 非橡皮擦模式
self.__painter.setPen(QPen(Qt.black,
self.__thickness)) # 设置画笔颜色，粗细
else:
# 橡皮擦模式下画笔为纯白色，粗细为10
self.__painter.setPen(QPen(Qt.white, self.__thickness))
# 画线
self.__painter.drawLine(self.__lastPos, self.__currentPos)
self.__painter.end()
self.__lastPos = self.__currentPos
self.update() # 更新显示
def mouse_release_event(self, mouse_event):
self.__undo_list.append(self.__board.toImage())
self.__redo_list = []
self.__undo_num += 1
self.__redo_num = 0
