【发布时间】：2017-06-09 00:15:48
【问题描述】：
做这个小sn-p吧：
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：
我在这里想弄清楚的是如何在网格交叉点上捕捉 QGraphicsTextItem每次我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，可以更好地解释我想要什么：
【问题讨论】：
标签： python python-3.x pyqt pyqt5