Commit 26b1f239 authored by Wichit Sombat's avatar Wichit Sombat

add sample usage to readme-lib.md in session 3

parent 94c7b22f
...@@ -26,8 +26,167 @@ cd ubuscribble/ ...@@ -26,8 +26,167 @@ cd ubuscribble/
python3 setup.py install --user python3 setup.py install --user
``` ```
5. run 5. usage
```sh ```python
BenApp #!/usr/bin/python3
from PyQt5.QtWidgets import QAction, QMenu, QMainWindow, QApplication, QMessageBox, QFileDialog, QInputDialog
from PyQt5.QtGui import QImage, QImageWriter
from PyQt5.QtCore import QDir
from ubuscribble.scribble import Scribble
class MainWindow(QMainWindow):
def __init__(self):
super(MainWindow, self).__init__()
self.saveAsActs = []
self.scribble= Scribble()
self.setCentralWidget(self.scribble)
self.createActions()
self.createMenus()
self.setWindowTitle("Scribble")
self.resize(500, 500)
def closeEvent(self, event):
if self.maybeSave():
event.accept()
else:
event.ignore()
def open(self):
if self.maybeSave():
fileName, _ = QFileDialog.getOpenFileName(self, "Open File",
QDir.currentPath())
if fileName:
self.scribble.openImage(fileName)
def save(self):
action = self.sender()
fileFormat = action.data()
self.saveFile(fileFormat)
def penColor(self):
newColor = QColorDialog.getColor(self.scribble.penColor())
if newColor.isValid():
self.scribble.setPenColor(newColor)
def penWidth(self):
newWidth, ok = QInputDialog.getInt(self, "Scribble",
"Select pen width:", self.scribble.penWidth(), 1, 50, 1)
if ok:
self.scribble.setPenWidth(newWidth)
def about(self):
QMessageBox.about(self, "About Scribble",
"<p>The <b>Scribble</b> example shows how to use "
"QMainWindow as the base widget for an application, and how "
"to reimplement some of QWidget's event handlers to receive "
"the events generated for the application's widgets:</p>"
"<p> We reimplement the mouse event handlers to facilitate "
"drawing, the paint event handler to update the application "
"and the resize event handler to optimize the application's "
"appearance. In addition we reimplement the close event "
"handler to intercept the close events before terminating "
"the application.</p>"
"<p> The example also demonstrates how to use QPainter to "
"draw an image in real time, as well as to repaint "
"widgets.</p>")
def createActions(self):
self.openAct = QAction("&Open...", self, shortcut="Ctrl+O",
triggered=self.open)
for format in QImageWriter.supportedImageFormats():
format = str(format)
text = format.upper() + "..."
action = QAction(text, self, triggered=self.save)
action.setData(format)
self.saveAsActs.append(action)
self.printAct = QAction("&Print...", self,
triggered=self.scribble.print_)
self.exitAct = QAction("E&xit", self, shortcut="Ctrl+Q",
triggered=self.close)
self.penColorAct = QAction("&Pen Color...", self,
triggered=self.penColor)
self.penWidthAct = QAction("Pen &Width...", self,
triggered=self.penWidth)
self.clearScreenAct = QAction("&Clear Screen", self, shortcut="Ctrl+L",
triggered=self.scribble.clearImage)
self.aboutAct = QAction("&About", self, triggered=self.about)
self.aboutQtAct = QAction("About &Qt", self,
triggered=QApplication.instance().aboutQt)
def createMenus(self):
self.saveAsMenu = QMenu("&Save As", self)
for action in self.saveAsActs:
self.saveAsMenu.addAction(action)
fileMenu = QMenu("&File", self)
fileMenu.addAction(self.openAct)
fileMenu.addMenu(self.saveAsMenu)
fileMenu.addAction(self.printAct)
fileMenu.addSeparator()
fileMenu.addAction(self.exitAct)
optionMenu = QMenu("&Options", self)
optionMenu.addAction(self.penColorAct)
optionMenu.addAction(self.penWidthAct)
optionMenu.addSeparator()
optionMenu.addAction(self.clearScreenAct)
helpMenu = QMenu("&Help", self)
helpMenu.addAction(self.aboutAct)
helpMenu.addAction(self.aboutQtAct)
self.menuBar().addMenu(fileMenu)
self.menuBar().addMenu(optionMenu)
self.menuBar().addMenu(helpMenu)
def maybeSave(self):
if self.scribble.isModified():
ret = QMessageBox.warning(self, "Scribble",
"The image has been modified.\n"
"Do you want to save your changes?",
QMessageBox.Save | QMessageBox.Discard |
QMessageBox.Cancel)
if ret == QMessageBox.Save:
return self.saveFile('png')
elif ret == QMessageBox.Cancel:
return False
return True
def saveFile(self, fileFormat):
initialPath = QDir.currentPath() + '/untitled.' + fileFormat
fileName, _ = QFileDialog.getSaveFileName(self, "Save As", initialPath,
"%s Files (*.%s);;All Files (*)" % (fileFormat.upper(), fileFormat))
if fileName:
return self.scribble.saveImage(fileName, fileFormat)
return False
if __name__ == '__main__':
import sys
app = QApplication(sys.argv)
window = MainWindow()
window.show()
sys.exit(app.exec_())
``` ```
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