python3+PyQt5 图形项的自定义和交互--实现page Designer应用程序
来源:互联网 发布:matlab怎样优化伯德图 编辑:程序博客网 时间:2024/05/12 11:17
本文通过Python3+PyQt5实现《python Qt Gui 快速编程》这本书的page Designer应用程序,采用QGraphicsView,QGraphicsScene,QGraphicsItem,这个程序包含有多个文本,图片和框的页面。有些图形类在PyQt5已过时,所以本代码改动幅度比较大。主要的类或方法的改变如下:
QMatrix==>QTransform
setMatrix==>setTransform
rotate ==> setRotation
本例中,由于event.delta()已过时,还重写了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)
为了保持代码可读行,增加了一个类:
class GraphicsPixmapItem(QGraphicsPixmapItem): #add by yangrongdong def __init__(self,pixmap): super(QGraphicsPixmapItem, self).__init__(pixmap)
本例中还有包含菜单的按钮:
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)
本例中还针对QStyleOptionGraphicsItem.levelOfDetail已过时,改写如下:
option.levelOfDetailFromTransform(self.transform())
下面为完整的代码:
#!/usr/bin/env python3import functoolsimport randomimport sysfrom 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,QPixmapfrom PyQt5.QtPrintSupport import QPrinter,QPrintDialogMAC = Truetry: from PyQt5.QtGui import qt_mac_set_native_menubarexcept ImportError: MAC = False#PageSize = (595, 842) # A4 in pointsPageSize = (612, 792) # US Letter in pointsPointSize = 10MagicNumber = 0x70616765FileVersion = 1Dirty = Falseclass 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 yangrongdongapp = 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_()
运行结果
0 0
- python3+PyQt5 图形项的自定义和交互--实现page Designer应用程序
- python3+PyQt5+Qt Designer实现扩展对话框
- python3+PyQt5+Qt Designer实现扩展对话框
- python3+PyQt5 实现支持多线程的页面索引器应用程序
- python3+PyQt5+Qt Designer实现Tab标签页部件
- python3+PyQt5+Qt Designer实现堆叠窗口部件
- python3+PyQt5 自定义视图
- python3+PyQt5实现拖放
- python3+PyQt5 使用自定义委托控制数据项的展示和 编辑
- python3+PyQt5 重新实现自定义数据拖放处理
- python3+PyQt5 实现自定义窗口部件--分数滑块
- python3+PyQt5 实现自定义窗口部件--流体混合窗口部件
- PyQt5使用Designer设计UI的两种实现方式
- pyqt5.8.2没有qt Designer和assistant exe的问题
- pyqt5在QT Designer中自定义插件
- python3+PyQt5 动画和复杂形状--实现千足蛇动画程序
- python3+PyQt5 实现Rich文本的行编辑
- 一个基于python3+PyQt5实现的简单计算器程序
- BootStrap学习与实践(一)
- cocoapod安装,第三方库的安装与删除
- scala学习笔记之安装
- source insight 阅读源码,注释为乱码解决方案
- 第四届蓝桥杯C++A组——颠倒的价牌
- python3+PyQt5 图形项的自定义和交互--实现page Designer应用程序
- R语言编程练习【1】
- JSTL中循环标签的使用
- 磁盘满了处理
- Andriod java.lang.OutOfMemoryError
- 磁盘镜像文件的制作
- Solr6.3 Getting Started managed-schema配置介绍
- 基于redis分布式缓存实现
- 在javaScript中检测数据类型的几种方式