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Open and save HTML in a PyQt5 browser

Adding file dialogs to load and save HTML

A File menu was added with self.menuBar().addMenu("&File") assigning the F key as a Alt-shortcut. Once we have the menu object, we can can add QAction objects to it to create the entries. We create two basic entries here for opening and saving HTML files (from a local disk). These both require custom slot method.

python
file_menu = self.menuBar().addMenu("&File")

open_file_action = QAction( QIcon( os.path.join('icons','disk--arrow.png') ), "Open file...", self)
open_file_action.setStatusTip("Open from file")
open_file_action.triggered.connect( self.open_file )
file_menu.addAction(open_file_action)

save_file_action = QAction( QIcon( os.path.join('icons','disk--pencil.png') ), "Save Page As...", self)
save_file_action.setStatusTip("Save current page to file")
save_file_action.triggered.connect( self.save_file )
file_menu.addAction(save_file_action)
````

The slot method for opening a file uses the built-in
`QFileDialog.getOpenFileName()` method to create a
file-open dialog and get a name. We restrict the names by
default to files matching `\*.htm` or `*.html`.

We read the file into a variable `html` using standard
Python functions, then use `.setHtml()` to load the HTML
into the browser.

```python
def open_file(self):
    filename, _ = QFileDialog.getOpenFileName(self, "Open file", "",
                    "Hypertext Markup Language (*.htm *.html);;"
                    "All files (*.*)")

    if filename:
        with open(filename, 'r') as f:
            html = f.read()

        self.browser.setHtml( html )
        self.urlbar.setText( filename )

Similarly to save the HTML from the current page, we use the built-in QFileDialog.getSaveFileName() to get a filename. However, this time we get the HTML from self.browser.page().toHtml() and write it to the selected filename. Again we use standard Python functions for the file handler.

python
def save_file(self):
    filename, _ = QFileDialog.getSaveFileName(self, "Save Page As", "",
                    "Hypertext Markup Language (*.htm *html);;"
                    "All files (*.*)")

    if filename:
        html = self.browser.page().toHtml()
        with open(filename, 'w') as f:
            f.write(html)

Now we have the basic file operations in place. In the next part we'll next improve the interface further by adding a custom Help & About dialog to inform our users.

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