python3+PyQt5圖形項(xiàng)的自定義和交互 python3實(shí)現(xiàn)page Designer應(yīng)用程序
本文通過Python3+PyQt5實(shí)現(xiàn)《python Qt Gui 快速編程》這本書的page Designer應(yīng)用程序,采用QGraphicsView,QGraphicsScene,QGraphicsItem,這個程序包含有多個文本,圖片和框的頁面。有些圖形類在PyQt5已過時(shí),所以本代碼改動幅度比較大。主要的類或方法的改變?nèi)缦拢?/p>
QMatrix==>QTransform
setMatrix==>setTransform
rotate ==> setRotation
本例中,由于event.delta()已過時(shí),還重寫了wheelEvent方法:
def wheelEvent(self, event): #factor = 1.41 ** (-event.delta() / 240.0) #factor = 1.41 ** (-abs(event.startX()-event.y()) / 240.0) factor = event.angleDelta().y()/120.0 if event.angleDelta().y()/120.0 > 0: factor=2 else: factor=0.5 self.scale(factor, factor)
為了保持代碼可讀行,增加了一個類:
class GraphicsPixmapItem(QGraphicsPixmapItem): #add by yangrongdong def __init__(self,pixmap): super(QGraphicsPixmapItem, self).__init__(pixmap)
本例中還有包含菜單的按鈕:
if text == "&Align":
menu = QMenu(self)
for text, arg in (
("Align &Left", Qt.AlignLeft),
("Align &Right", Qt.AlignRight),
("Align &Top", Qt.AlignTop),
("Align &Bottom", Qt.AlignBottom)):
wrapper = functools.partial(self.setAlignment, arg)
self.wrapped.append(wrapper)
menu.addAction(text, wrapper)
button.setMenu(menu)
本例中還針對QStyleOptionGraphicsItem.levelOfDetail已過時(shí),改寫如下:
option.levelOfDetailFromTransform(self.transform())
下面為完整的代碼:
#!/usr/bin/env python3
import functools
import random
import sys
from PyQt5.QtCore import (QByteArray, QDataStream, QFile, QFileInfo,
QIODevice, QPoint, QPointF, QRectF, Qt)
from PyQt5.QtWidgets import (QApplication, QDialog,
QDialogButtonBox, QFileDialog, QFontComboBox,
QGraphicsItem, QGraphicsPixmapItem,
QGraphicsScene, QGraphicsTextItem, QGraphicsView, QGridLayout,
QHBoxLayout, QLabel, QMenu, QMessageBox,QPushButton, QSpinBox,
QStyle, QTextEdit, QVBoxLayout)
from PyQt5.QtGui import QFont,QCursor,QFontMetrics,QTransform,QPainter,QPen,QPixmap
from PyQt5.QtPrintSupport import QPrinter,QPrintDialog
MAC = True
try:
from PyQt5.QtGui import qt_mac_set_native_menubar
except ImportError:
MAC = False
#PageSize = (595, 842) # A4 in points
PageSize = (612, 792) # US Letter in points
PointSize = 10
MagicNumber = 0x70616765
FileVersion = 1
Dirty = False
class TextItemDlg(QDialog):
def __init__(self, item=None, position=None, scene=None, parent=None):
super(QDialog, self).__init__(parent)
self.item = item
self.position = position
self.scene = scene
self.editor = QTextEdit()
self.editor.setAcceptRichText(False)
self.editor.setTabChangesFocus(True)
editorLabel = QLabel("&Text:")
editorLabel.setBuddy(self.editor)
self.fontComboBox = QFontComboBox()
self.fontComboBox.setCurrentFont(QFont("Times", PointSize))
fontLabel = QLabel("&Font:")
fontLabel.setBuddy(self.fontComboBox)
self.fontSpinBox = QSpinBox()
self.fontSpinBox.setAlignment(Qt.AlignRight|Qt.AlignVCenter)
self.fontSpinBox.setRange(6, 280)
self.fontSpinBox.setValue(PointSize)
fontSizeLabel = QLabel("&Size:")
fontSizeLabel.setBuddy(self.fontSpinBox)
self.buttonBox = QDialogButtonBox(QDialogButtonBox.Ok|
QDialogButtonBox.Cancel)
self.buttonBox.button(QDialogButtonBox.Ok).setEnabled(False)
if self.item is not None:
self.editor.setPlainText(self.item.toPlainText())
self.fontComboBox.setCurrentFont(self.item.font())
self.fontSpinBox.setValue(self.item.font().pointSize())
layout = QGridLayout()
layout.addWidget(editorLabel, 0, 0)
layout.addWidget(self.editor, 1, 0, 1, 6)
layout.addWidget(fontLabel, 2, 0)
layout.addWidget(self.fontComboBox, 2, 1, 1, 2)
layout.addWidget(fontSizeLabel, 2, 3)
layout.addWidget(self.fontSpinBox, 2, 4, 1, 2)
layout.addWidget(self.buttonBox, 3, 0, 1, 6)
self.setLayout(layout)
self.fontComboBox.currentFontChanged.connect(self.updateUi)
self.fontSpinBox.valueChanged.connect(self.updateUi)
self.editor.textChanged.connect(self.updateUi)
self.buttonBox.accepted.connect(self.accept)
self.buttonBox.rejected.connect(self.reject)
self.setWindowTitle("Page Designer - {0} Text Item".format(
"Add" if self.item is None else "Edit"))
self.updateUi()
def updateUi(self):
font = self.fontComboBox.currentFont()
font.setPointSize(self.fontSpinBox.value())
self.editor.document().setDefaultFont(font)
self.buttonBox.button(QDialogButtonBox.Ok).setEnabled(
bool(self.editor.toPlainText()))
def accept(self):
if self.item is None:
self.item = TextItem("", self.position, self.scene)
font = self.fontComboBox.currentFont()
font.setPointSize(self.fontSpinBox.value())
self.item.setFont(font)
self.item.setPlainText(self.editor.toPlainText())
self.item.update()
global Dirty
Dirty = True
QDialog.accept(self)
class TextItem(QGraphicsTextItem):
def __init__(self, text, position, scene,
font=QFont("Times", PointSize), matrix=QTransform()):
super(TextItem, self).__init__(text)
self.setFlags(QGraphicsItem.ItemIsSelectable|
QGraphicsItem.ItemIsMovable)
self.setFont(font)
self.setPos(position)
self.setTransform(matrix)
scene.clearSelection()
scene.addItem(self)
self.setSelected(True)
global Dirty
Dirty = True
def parentWidget(self):
return self.scene().views()[0]
def itemChange(self, change, variant):
if change != QGraphicsItem.ItemSelectedChange:
global Dirty
Dirty = True
return QGraphicsTextItem.itemChange(self, change, variant)
def mouseDoubleClickEvent(self, event):
dialog = TextItemDlg(self, self.parentWidget())
dialog.exec_()
class GraphicsPixmapItem(QGraphicsPixmapItem): #add by yangrongdong
def __init__(self,pixmap):
super(QGraphicsPixmapItem, self).__init__(pixmap)
class BoxItem(QGraphicsItem):
def __init__(self, position, scene, style=Qt.SolidLine,
rect=None, matrix=QTransform()):
super(BoxItem, self).__init__()
self.setFlags(QGraphicsItem.ItemIsSelectable|
QGraphicsItem.ItemIsMovable|
QGraphicsItem.ItemIsFocusable)
if rect is None:
rect = QRectF(-10 * PointSize, -PointSize, 20 * PointSize,
2 * PointSize)
self.rect = rect
self.style = style
self.setPos(position)
self.setTransform(matrix)
scene.clearSelection()
scene.addItem(self)
self.setSelected(True)
self.setFocus()
global Dirty
Dirty = True
def parentWidget(self):
return self.scene().views()[0]
def boundingRect(self):
return self.rect.adjusted(-2, -2, 2, 2)
def paint(self, painter, option, widget):
pen = QPen(self.style)
pen.setColor(Qt.black)
pen.setWidth(1)
if option.state & QStyle.State_Selected:
pen.setColor(Qt.blue)
painter.setPen(pen)
painter.drawRect(self.rect)
def itemChange(self, change, variant):
if change != QGraphicsItem.ItemSelectedChange:
global Dirty
Dirty = True
return QGraphicsItem.itemChange(self, change, variant)
def contextMenuEvent(self, event):
wrapped = []
menu = QMenu(self.parentWidget())
for text, param in (
("&Solid", Qt.SolidLine),
("&Dashed", Qt.DashLine),
("D&otted", Qt.DotLine),
("D&ashDotted", Qt.DashDotLine),
("DashDo&tDotted", Qt.DashDotDotLine)):
wrapper = functools.partial(self.setStyle, param)
wrapped.append(wrapper)
menu.addAction(text, wrapper)
menu.exec_(event.screenPos())
def setStyle(self, style):
self.style = style
self.update()
global Dirty
Dirty = True
def keyPressEvent(self, event):
factor = PointSize / 4
changed = False
if event.modifiers() & Qt.ShiftModifier:
if event.key() == Qt.Key_Left:
self.rect.setRight(self.rect.right() - factor)
changed = True
elif event.key() == Qt.Key_Right:
self.rect.setRight(self.rect.right() + factor)
changed = True
elif event.key() == Qt.Key_Up:
self.rect.setBottom(self.rect.bottom() - factor)
changed = True
elif event.key() == Qt.Key_Down:
self.rect.setBottom(self.rect.bottom() + factor)
changed = True
if changed:
self.update()
global Dirty
Dirty = True
else:
QGraphicsItem.keyPressEvent(self, event)
class GraphicsView(QGraphicsView):
def __init__(self, parent=None):
super(GraphicsView, self).__init__(parent)
self.setDragMode(QGraphicsView.RubberBandDrag)
self.setRenderHint(QPainter.Antialiasing)
self.setRenderHint(QPainter.TextAntialiasing)
def wheelEvent(self, event):
#factor = 1.41 ** (-event.delta() / 240.0)
factor = event.angleDelta().y()/120.0
if event.angleDelta().y()/120.0 > 0:
factor=2
else:
factor=0.5
self.scale(factor, factor)
class MainForm(QDialog):
def __init__(self, parent=None):
super(MainForm, self).__init__(parent)
self.filename = ""
self.copiedItem = QByteArray()
self.pasteOffset = 5
self.prevPoint = QPoint()
self.addOffset = 5
self.borders = []
self.printer = QPrinter(QPrinter.HighResolution)
self.printer.setPageSize(QPrinter.Letter)
self.view = GraphicsView()
self.scene = QGraphicsScene(self)
self.scene.setSceneRect(0, 0, PageSize[0], PageSize[1])
self.addBorders()
self.view.setScene(self.scene)
self.wrapped = [] # Needed to keep wrappers alive
buttonLayout = QVBoxLayout()
for text, slot in (
("Add &Text", self.addText),
("Add &Box", self.addBox),
("Add Pi&xmap", self.addPixmap),
("&Align", None),
("&Copy", self.copy),
("C&ut", self.cut),
("&Paste", self.paste),
("&Delete...", self.delete),
("&Rotate", self.rotate),
("Pri&nt...", self.print_),
("&Open...", self.open),
("&Save", self.save),
("&Quit", self.accept)):
button = QPushButton(text)
if not MAC:
button.setFocusPolicy(Qt.NoFocus)
if slot is not None:
button.clicked.connect(slot)
if text == "&Align":
menu = QMenu(self)
for text, arg in (
("Align &Left", Qt.AlignLeft),
("Align &Right", Qt.AlignRight),
("Align &Top", Qt.AlignTop),
("Align &Bottom", Qt.AlignBottom)):
wrapper = functools.partial(self.setAlignment, arg)
self.wrapped.append(wrapper)
menu.addAction(text, wrapper)
button.setMenu(menu)
if text == "Pri&nt...":
buttonLayout.addStretch(5)
if text == "&Quit":
buttonLayout.addStretch(1)
buttonLayout.addWidget(button)
buttonLayout.addStretch()
layout = QHBoxLayout()
layout.addWidget(self.view, 1)
layout.addLayout(buttonLayout)
self.setLayout(layout)
fm = QFontMetrics(self.font())
self.resize(self.scene.width() + fm.width(" Delete... ") + 50,
self.scene.height() + 50)
self.setWindowTitle("Page Designer")
def addBorders(self):
self.borders = []
rect = QRectF(0, 0, PageSize[0], PageSize[1])
self.borders.append(self.scene.addRect(rect, Qt.yellow))
margin = 5.25 * PointSize
self.borders.append(self.scene.addRect(
rect.adjusted(margin, margin, -margin, -margin),
Qt.yellow))
def removeBorders(self):
while self.borders:
item = self.borders.pop()
self.scene.removeItem(item)
del item
def reject(self):
self.accept()
def accept(self):
self.offerSave()
QDialog.accept(self)
def offerSave(self):
if (Dirty and QMessageBox.question(self,
"Page Designer - Unsaved Changes",
"Save unsaved changes?",
QMessageBox.Yes|QMessageBox.No) ==
QMessageBox.Yes):
self.save()
def position(self):
point = self.mapFromGlobal(QCursor.pos())
if not self.view.geometry().contains(point):
coord = random.randint(36, 144)
point = QPoint(coord, coord)
else:
if point == self.prevPoint:
point += QPoint(self.addOffset, self.addOffset)
self.addOffset += 5
else:
self.addOffset = 5
self.prevPoint = point
return self.view.mapToScene(point)
def addText(self):
dialog = TextItemDlg(position=self.position(),
scene=self.scene, parent=self)
dialog.exec_()
def addBox(self):
BoxItem(self.position(), self.scene)
def addPixmap(self):
path = (QFileInfo(self.filename).path()
if self.filename else ".")
fname,filetype = QFileDialog.getOpenFileName(self,
"Page Designer - Add Pixmap", path,
"Pixmap Files (*.bmp *.jpg *.png *.xpm)")
if not fname:
return
self.createPixmapItem(QPixmap(fname), self.position())
def createPixmapItem(self, pixmap, position, matrix=QTransform()):
item = GraphicsPixmapItem(pixmap)
item.setFlags(QGraphicsItem.ItemIsSelectable|
QGraphicsItem.ItemIsMovable)
item.setPos(position)
item.setTransform(matrix)
self.scene.clearSelection()
self.scene.addItem(item)
item.setSelected(True)
global Dirty
Dirty = True
return item
def selectedItem(self):
items = self.scene.selectedItems()
if len(items) == 1:
return items[0]
return None
def copy(self):
item = self.selectedItem()
if item is None:
return
self.copiedItem.clear()
self.pasteOffset = 5
stream = QDataStream(self.copiedItem, QIODevice.WriteOnly)
self.writeItemToStream(stream, item)
def cut(self):
item = self.selectedItem()
if item is None:
return
self.copy()
self.scene.removeItem(item)
del item
def paste(self):
if self.copiedItem.isEmpty():
return
stream = QDataStream(self.copiedItem, QIODevice.ReadOnly)
self.readItemFromStream(stream, self.pasteOffset)
self.pasteOffset += 5
def setAlignment(self, alignment):
# Items are returned in arbitrary order
items = self.scene.selectedItems()
if len(items) <= 1:
return
# Gather coordinate data
leftXs, rightXs, topYs, bottomYs = [], [], [], []
for item in items:
rect = item.sceneBoundingRect()
leftXs.append(rect.x())
rightXs.append(rect.x() + rect.width())
topYs.append(rect.y())
bottomYs.append(rect.y() + rect.height())
# Perform alignment
if alignment == Qt.AlignLeft:
xAlignment = min(leftXs)
for i, item in enumerate(items):
item.moveBy(xAlignment - leftXs[i], 0)
elif alignment == Qt.AlignRight:
xAlignment = max(rightXs)
for i, item in enumerate(items):
item.moveBy(xAlignment - rightXs[i], 0)
elif alignment == Qt.AlignTop:
yAlignment = min(topYs)
for i, item in enumerate(items):
item.moveBy(0, yAlignment - topYs[i])
elif alignment == Qt.AlignBottom:
yAlignment = max(bottomYs)
for i, item in enumerate(items):
item.moveBy(0, yAlignment - bottomYs[i])
global Dirty
Dirty = True
def rotate(self):
for item in self.scene.selectedItems():
item.setRotation(item.rotation()+30)
def delete(self):
items = self.scene.selectedItems()
if (len(items) and QMessageBox.question(self,
"Page Designer - Delete",
"Delete {0} item{1}?".format(len(items),
"s" if len(items) != 1 else ""),
QMessageBox.Yes|QMessageBox.No) ==
QMessageBox.Yes):
while items:
item = items.pop()
self.scene.removeItem(item)
del item
global Dirty
Dirty = True
def print_(self):
dialog = QPrintDialog(self.printer)
if dialog.exec_():
painter = QPainter(self.printer)
painter.setRenderHint(QPainter.Antialiasing)
painter.setRenderHint(QPainter.TextAntialiasing)
self.scene.clearSelection()
self.removeBorders()
self.scene.render(painter)
self.addBorders()
def open(self):
self.offerSave()
path = (QFileInfo(self.filename).path()
if self.filename else ".")
fname,filetype = QFileDialog.getOpenFileName(self,
"Page Designer - Open", path,
"Page Designer Files (*.pgd)")
if not fname:
return
self.filename = fname
fh = None
try:
fh = QFile(self.filename)
if not fh.open(QIODevice.ReadOnly):
raise IOError(str(fh.errorString()))
items = self.scene.items()
while items:
item = items.pop()
self.scene.removeItem(item)
del item
self.addBorders()
stream = QDataStream(fh)
stream.setVersion(QDataStream.Qt_5_7)
magic = stream.readInt32()
if magic != MagicNumber:
raise IOError("not a valid .pgd file")
fileVersion = stream.readInt16()
if fileVersion != FileVersion:
raise IOError("unrecognised .pgd file version")
while not fh.atEnd():
self.readItemFromStream(stream)
except IOError as e:
QMessageBox.warning(self, "Page Designer -- Open Error",
"Failed to open {0}: {1}".format(self.filename, e))
finally:
if fh is not None:
fh.close()
global Dirty
Dirty = False
def save(self):
if not self.filename:
path = "."
fname,filetype = QFileDialog.getSaveFileName(self,
"Page Designer - Save As", path,
"Page Designer Files (*.pgd)")
if not fname:
return
self.filename = fname
fh = None
try:
fh = QFile(self.filename)
if not fh.open(QIODevice.WriteOnly):
raise IOError(str(fh.errorString()))
self.scene.clearSelection()
stream = QDataStream(fh)
stream.setVersion(QDataStream.Qt_5_7)
stream.writeInt32(MagicNumber)
stream.writeInt16(FileVersion)
for item in self.scene.items():
self.writeItemToStream(stream, item)
except IOError as e:
QMessageBox.warning(self, "Page Designer -- Save Error",
"Failed to save {0}: {1}".format(self.filename, e))
finally:
if fh is not None:
fh.close()
global Dirty
Dirty = False
def readItemFromStream(self, stream, offset=0):
type = ""
position = QPointF()
matrix = QTransform()
rotateangle=0#add by yangrongdong
type=stream.readQString()
stream >> position >> matrix
if offset:
position += QPointF(offset, offset)
if type == "Text":
text = ""
font = QFont()
text=stream.readQString()
stream >> font
rotateangle=stream.readFloat()
tx=TextItem(text, position, self.scene, font, matrix)
tx.setRotation(rotateangle)
elif type == "Box":
rect = QRectF()
stream >> rect
style = Qt.PenStyle(stream.readInt16())
rotateangle=stream.readFloat()
bx=BoxItem(position, self.scene, style, rect, matrix)
bx.setRotation(rotateangle)
elif type == "Pixmap":
pixmap = QPixmap()
stream >> pixmap
rotateangle=stream.readFloat()
px=self.createPixmapItem(pixmap, position, matrix)
px.setRotation(rotateangle)
def writeItemToStream(self, stream, item):
if isinstance(item, TextItem):
stream.writeQString("Text")
stream<<item.pos()<< item.transform()
stream.writeQString(item.toPlainText())
stream<< item.font()
stream.writeFloat(item.rotation())#add by yangrongdong
elif isinstance(item, GraphicsPixmapItem):
stream.writeQString("Pixmap")
stream << item.pos() << item.transform() << item.pixmap()
stream.writeFloat(item.rotation())#add by yangrongdong
elif isinstance(item, BoxItem):
stream.writeQString("Box")
stream<< item.pos() << item.transform() << item.rect
stream.writeInt16(item.style)
stream.writeFloat(item.rotation())#add by yangrongdong
app = QApplication(sys.argv)
form = MainForm()
rect = QApplication.desktop().availableGeometry()
form.resize(int(rect.width() * 0.6), int(rect.height() * 0.9))
form.show()
app.exec_()
運(yùn)行結(jié)果

以上就是本文的全部內(nèi)容,希望對大家的學(xué)習(xí)有所幫助,也希望大家多多支持腳本之家。
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