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python - 如何对齐 QGraphicsTextItem 的网格?

转载 作者:太空狗 更新时间:2023-10-30 00:05:29 25 4
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让这个小片段:

import sys
from PyQt5 import QtWidgets
from PyQt5 import QtCore
from PyQt5 import QtGui
from PyQt5.QtWidgets import QMenu
from PyQt5.QtGui import QKeySequence
from PyQt5.QtCore import Qt
from PyQt5.QtGui import QCursor
from PyQt5.QtWidgets import QGraphicsObject
from PyQt5.QtCore import QRectF
from PyQt5.QtGui import QBrush
from PyQt5.QtCore import QPoint
from PyQt5.QtGui import QLinearGradient
from PyQt5.QtGui import QColor
from PyQt5.QtGui import QPen
from PyQt5.QtGui import QPainter
from PyQt5.QtWidgets import QGraphicsTextItem
from PyQt5.QtWidgets import QGraphicsItem


def create_action(parent, text, slot=None,
shortcut=None, shortcuts=None, shortcut_context=None,
icon=None, tooltip=None,
checkable=False, checked=False):
action = QtWidgets.QAction(text, parent)

if icon is not None:
action.setIcon(QIcon(':/%s.png' % icon))
if shortcut is not None:
action.setShortcut(shortcut)
if shortcuts is not None:
action.setShortcuts(shortcuts)
if shortcut_context is not None:
action.setShortcutContext(shortcut_context)
if tooltip is not None:
action.setToolTip(tooltip)
action.setStatusTip(tooltip)
if checkable:
action.setCheckable(True)
if checked:
action.setChecked(True)
if slot is not None:
action.triggered.connect(slot)

return action


class Settings():

WIDTH = 20
HEIGHT = 15
NUM_BLOCKS_X = 32
NUM_BLOCKS_Y = 16


class CI(QGraphicsTextItem):

def __init__(self, text, pos):
QGraphicsTextItem.__init__(self)

self.content = text
self.setPlainText(text)

self.setPos(pos)
self.setTextInteractionFlags(Qt.TextEditorInteraction)
self.setDefaultTextColor(Qt.black)
self.setFlags(
self.flags() | QGraphicsItem.ItemIsMovable | QGraphicsItem.ItemIsSelectable)
self.setZValue(-1)

def paint(self, painter, option, widget):
painter.save()
painter.setBrush(QBrush(Qt.white))
painter.drawRect(self.boundingRect())
painter.restore()

super().paint(painter, option, widget)

def keyPressEvent(self, event):
super().keyPressEvent(event)
self.content = self.toPlainText()

def focusInEvent(self, event):
self.scene().writing_comment = True
# self.setPlainText(self.content)
# print("Focusinevent")

def focusOutEvent(self, event):
self.scene().writing_comment = False
# self.setHtml(self.content)
# print("FocusOutevent")

def contextMenuEvent(self, scme):
super().contextMenuEvent(scme)


class QS(QtWidgets.QGraphicsScene):

def __init__(self, *args, **kwargs):
super().__init__(*args, **kwargs)

width = Settings.NUM_BLOCKS_X * Settings.WIDTH
height = Settings.NUM_BLOCKS_Y * Settings.HEIGHT
self.setSceneRect(0, 0, width, height)
self.setItemIndexMethod(QtWidgets.QGraphicsScene.NoIndex)

pos = QPoint(
5 * Settings.WIDTH,
2 * Settings.HEIGHT
)
content = """<!DOCTYPE html>
<html>
<body>

<h1>This is heading 1</h1>
<h2>This is heading 2</h2>
<h3>This is heading 3</h3>
<h4>This is heading 4</h4>
<h5>This is heading 5</h5>
<h6>This is heading 6</h6>

</body>
</html>
"""
self.addItem(CI(content, pos))


class QV(QtWidgets.QGraphicsView):

def __init__(self, *args, **kwargs):
super().__init__(*args, **kwargs)

self.view_menu = QMenu(self)
self.create_actions()

def create_actions(self):
act = create_action(self.view_menu, "Zoom in",
slot=self.on_zoom_in,
shortcut=QKeySequence("+"), shortcut_context=Qt.WidgetShortcut)
self.view_menu.addAction(act)

act = create_action(self.view_menu, "Zoom out",
slot=self.on_zoom_out,
shortcut=QKeySequence("-"), shortcut_context=Qt.WidgetShortcut)
self.view_menu.addAction(act)
self.addActions(self.view_menu.actions())

def on_zoom_in(self):
if not self.scene():
return

self.scale(1.5, 1.5)

def on_zoom_out(self):
if not self.scene():
return

self.scale(1.0 / 1.5, 1.0 / 1.5)

def drawBackground(self, painter, rect):
painter.setRenderHint(QPainter.Antialiasing, True)

gr = rect.toRect()
start_x = gr.left() + Settings.WIDTH - (gr.left() % Settings.WIDTH)
start_y = gr.top() + Settings.HEIGHT - (gr.top() % Settings.HEIGHT)
painter.save()

for index, x in enumerate(range(start_x, gr.right(), Settings.WIDTH)):
if index == Settings.NUM_BLOCKS_X:
painter.setPen(QtGui.QColor(255, 70, 80).lighter(90))
painter.setOpacity(0.7)
else:
painter.setPen(QtGui.QColor(60, 70, 80).lighter(90))
painter.setOpacity(0.7)

painter.drawLine(x, gr.top(), x, gr.bottom())

for index, y in enumerate(range(start_y, gr.bottom(), Settings.HEIGHT)):
if index == Settings.NUM_BLOCKS_Y:
painter.setPen(QtGui.QColor(255, 70, 80).lighter(90))
painter.setOpacity(0.7)
else:
painter.setPen(QtGui.QColor(60, 70, 80).lighter(90))
painter.setOpacity(0.7)

painter.drawLine(gr.left(), y, gr.right(), y)

painter.restore()

super().drawBackground(painter, rect)


if __name__ == '__main__':
app = QtWidgets.QApplication(sys.argv)

a = QS()
b = QV()
b.setScene(a)
print(b.mapToScene(b.rect()))
b.show()
sys.exit(app.exec_())

如果我们运行它,我们会看到它正在创建一个带有网格和 QGraphicsTextItem 的小场景,如下所示:

enter image description here

我在这里想弄清楚的是如何在网格交叉点上捕捉 QGraphicsTextItem 每次移动它或调整它的大小(当我写一些文本时),我怎么能保证?这是一张小图片,可以更好地解释我想要什么:

enter image description here

最佳答案

要设置QGraphicsTextItem的新宽度和高度,您可以覆盖boundingRect(),到setPos(),您可以使用任何适当的事件,例如 MouseReleaseEventMouseMoveEvent,并从最后一个 pos() 计算下一个左上角网格交点:

class CI(QGraphicsTextItem):

def __init__(self, text, pos):
QGraphicsTextItem.__init__(self)

self.content = text
self.setPlainText(text)

self.setPos(pos)
self.setTextInteractionFlags(Qt.TextEditorInteraction)
self.setDefaultTextColor(Qt.black)
self.setFlags(
self.flags() | QGraphicsItem.ItemIsMovable | QGraphicsItem.ItemIsSelectable)
self.setZValue(-1)

def boundingRect(self):
# get the original width and height of boundingrect
br = QGraphicsTextItem.boundingRect(self)
brw = br.width()
brh = br.height()
# new width and height in "blocks"
wblocks = int(brw/Settings.WIDTH) + 1
hblocks = int(brh/Settings.HEIGHT) + 1
w = wblocks*Settings.WIDTH
h = hblocks*Settings.HEIGHT
return QtCore.QRectF(0, 0, w, h)

def mouseReleaseEvent(self, event):
# QGraphicsItem.mouseReleaseEvent(self, event)
QGraphicsTextItem.mouseReleaseEvent(self, event)
self.setGridIntersection(self.pos())

def mouseMoveEvent(self, event):
QGraphicsTextItem.mouseMoveEvent(self, event)
self.setGridIntersection(self.pos())

def setGridIntersection(self, pos):
# get the next grid intersection top left of items top-left corner
grid_x = int(pos.x()/Settings.WIDTH)
grid_y = int(pos.y()/Settings.HEIGHT)
self.setPos(grid_x*Settings.WIDTH, grid_y*Settings.HEIGHT)

def paint(self, painter, option, widget):
painter.save()
painter.setBrush(QBrush(Qt.white))
painter.drawRect(self.boundingRect())
painter.restore()

super().paint(painter, option, widget)

def keyPressEvent(self, event):
super().keyPressEvent(event)
self.content = self.toPlainText()

def focusInEvent(self, event):
self.scene().writing_comment = True
# self.setPlainText(self.content)
# print("Focusinevent")

def focusOutEvent(self, event):
self.scene().writing_comment = False
# self.setHtml(self.content)
# print("FocusOutevent")

def contextMenuEvent(self, scme):
super().contextMenuEvent(scme)

编辑 01.02.17:上面的解决方案只适用于单选,单选和多选都可以使用:

class CI(QGraphicsTextItem):

def __init__(self, text, pos):
QGraphicsTextItem.__init__(self)

self.content = text
self.setPlainText(text)

self.setPos(pos)
self.setTextInteractionFlags(Qt.TextEditorInteraction)
self.setDefaultTextColor(Qt.black)
self.setFlags(
self.flags() | QGraphicsItem.ItemIsMovable | QGraphicsItem.ItemIsSelectable)
self.setZValue(-1)
self.setAcceptDrops(True)

def boundingRect(self):
# get the original width and height of boundingrect
br = QGraphicsTextItem.boundingRect(self)
brw = br.width()
brh = br.height()
# new width and height in "blocks"
wblocks = int(brw / Settings.WIDTH) + 1
hblocks = int(brh / Settings.HEIGHT) + 1
w = wblocks * Settings.WIDTH
h = hblocks * Settings.HEIGHT
return QtCore.QRectF(0, 0, w, h)

def setGridIntersection(self, pos):
# get the next grid intersection top left of items top-left corner
grid_x = int(pos.x() / Settings.WIDTH)
grid_y = int(pos.y() / Settings.HEIGHT)
self.setPos(grid_x * Settings.WIDTH, grid_y * Settings.HEIGHT)

def paint(self, painter, option, widget):
painter.save()
painter.setBrush(QBrush(Qt.white))
painter.drawRect(self.boundingRect())
painter.restore()

super().paint(painter, option, widget)

def keyPressEvent(self, event):
super().keyPressEvent(event)
self.content = self.toPlainText()

def focusInEvent(self, event):
self.scene().writing_comment = True
# self.setPlainText(self.content)
# print("Focusinevent")

def focusOutEvent(self, event):
self.scene().writing_comment = False
# self.setHtml(self.content)
# print("FocusOutevent")

def contextMenuEvent(self, scme):
super().contextMenuEvent(scme)

并在 QS 类中添加:

    def mouseMoveEvent(self, event):
QtWidgets.QGraphicsScene.mouseMoveEvent(self, event)
for i in self.selectedItems():
if type(i) == CI:
i.setGridIntersection(i.pos())

关于python - 如何对齐 QGraphicsTextItem 的网格?,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/41824106/

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