Finish the exercises from Lab 6 and submit the following class definitions:
- GrayViewer.java
- ColorViewer.java
- YourNameFish.java
Write a program called FontBrowser with the graphical user interface shown below, that allows the user to interactively browse through all of the fonts available on the system:
The user selects the desired font from the pull-down menu. Bold and/or italic style can be specified by checking the appropriate boxes. The slider bar controls the size of the font. A text sample in the currently selected font is shown below the font controls. Choosing a new font from the menu, checking or unchecking a style box, or adjusting the font size slider bar should immediately update the text sample (and font size label) to reflect the new settings.
You can use this code as your starting point. Here are some further hints and guidelines:
The GUI window should consist of two panels: a control panel to hold the font controls, and a text panel to display the sample text in the selected font. For the font controls, you should use a JComboBox
(for the pull-down menu), two JCheckBoxes, a JSlider, and a JLabel (to show the font size). The text panel should contain a single JLabel that shows the sample text. The top level GUI frame should use a BorderLayout, with the control panel at the North and the text panel at the Center. To make the font controls work, you will need to attach listener objects to them. The menu and checkboxes require an ActionListener, whereas the slider bar requires a ChangeListener. Whenever the menu or checkboxes get updated, the ActionListener's actionPerformed(ActionEvent event) method will be called automatically. Whenever the slider bar is moved, the ChangeListener's stateChanged(ChangeEvent event) method will be called. You can define a single listener class that implements both interfaces simultaneously, or if you prefer, you can define two separate inner listener classes: one that implements the ActionListener interface, and another that implements the ChangeListener interface.
Define a helper method called updateSampleText() to update the text displayed in the text panel based on the currently selected font. By making this a separate method, you can avoid having to duplicate code in your listener classes.
The code below will create an array of Strings containing the names of all of the available fonts on the system:
GraphicsEnvironment env = GraphicsEnvironment.getLocalGraphicsEnvironment(); String[] fontNames = env.getAvailableFontFamilyNames();Here are some other useful methods to be aware of:
- label.setText(s) sets the text of a JLabel to the String s.
- label.setFont(f) sets the font of a JLabel to the Font object f.
- menu.getSelectedItem() returns a JComboBox's currently selected menu item as a generic Object, which must be type cast appropriately (e.g. to a String).
- menu.setSelectedItem(s) sets a JComboBox menu to the String s.
- checkbox.isSelected() returns a JCheckBox's current setting as a boolean (true or false).
- slider.getValue() returns a JSlider's current setting as an integer.
- new JSlider(min, max, initial) creates a new JSlider with the specified minimum, maximum, and initial values. Your slider bar should range from 10 to 72 and be initialized to 40.