Resizing a Window. COSC 3461: Module 5B. What is Widget Layout? Size State Transitions. What is Widget Layout? Hierarchical Widget Layout.
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1 COSC 3461: Module 5B Resizing a Window Widgets II What has changed? scrollbar added menu has wrapped toolbar modified (buttons lost) 2 What is Widget Layout? Size State Transitions Recall: each widget has a size and a position widgets belong to containers [what type? relationship to JFrame?] Widget Layout determines: layout of widgets following a change in window state what changes are possible to the window size state? S t S t+1 a=button Minimized Maximized Normal/Restored a=resize St-1 { Maximized, Normal/Restored } Minimized Maximized Normal/Restored 3 4 What is Widget Layout? Layout manager needs to determine: Initial positionof widgets in their container Initial size of widgets in their container Modified position of widgets in their container Modified size of widgets in their container Hierarchical Widget Layout Similar to containment hierarchy Widgets are arranged in a hierarchy Parent-child relationship signifies containment 5 6
2 Hierarchical Layout Attributes of the Layout Number of widgets displayed recall toolbar Position of widgets: recall toolbar X and Y screen coordinates need to calculate and recalculate Size of each widget recall menubar width and height (units are typically pixels) need to calculate and recalculate 7 8 Size Properties Example 5B.1, 5B.2, 5B.3 Components have the following attributes: Preferred size Minimum size Maximum size When a component is instantiated has default values for each of these attributes new values may be explicitly assigned These attributes are used by the Layout Manager to determine initial and modified component size Size may also affected by layout manager policies (more on this later) DemoSizeProperties.java DemoSize.java DemoPosition.java 9 10 Java s Layout Managers Java s Layout Managers Layout managers can be assigned to instances of which class(es)? In other words, what type of objects have layout managers? BorderLayout FlowLayout GridLayout BoxLayout GridBagLayout CardLayout OverlayLayout etc. spec. purpose very simple very simple very flexible very flexible spec. purpose 11 12
3 Models for Widget Layout Absolute 1. Absolute (aka fixed) Control for component size and position 2. Struts and springs Control for component position 3. Variable intrinsic size Control for component size Idea: specify position and size of widgets provide absolute values (not relative) position is specified by X and Y screen coordinates (typically in pixels) size is specified by width and height values (typically in pixels) layout manager doesn t do much Example 5B.4 Absolute DemoAbsolute.java Advantages Widgets retain their position and size when window is resized when might this be desired? Simple to specify layout initially Disadvantages Widgets retain their position and size when window is resized Enlarging: too much empty space (more in Module 6, Evaluation) Shrinking: components lost (how might this instead be handled?) Difficult to modify layout - many magic numbers /defined constants Struts and Springs Struts and Springs (2) Idea: specify position of widgets specification provided in terms of constraints and geometric relationships between widgets widget size and position is determined by layout manager, which attempts to maintain geometric relationships Place struts and springs into layout Struts ( ) - fixed regions they don t change Springs ( ) relative regions can be compressed or stretched Text Field Button 17 18
4 Struts and Springs (3) Variable Intrinsic Size Advantages When the window is resized, widget position is determined automatically by constraint equations Easy to use Handles window resizing appropriately Idea: specify intrinsic size values for widgets intrinsic = pertaining to the inherent or essential nature of a thing (cf extrinsic = originating from the outside, external) intrinsic values capture a range of acceptable values: preferred size, minimum size, maximum size let layout manager determine which size value should be used During layout, components report their size properties to the layout manager (recursively, if necessary) Designers have limited control over this Some layout managers respect size properties, while others do not! Variable Intrinsic Size Widget Communication Advantages Layout manager determines appropriate values Disadvantages Designers have limited control over this Some layout managers respect size properties, while others do not! 21 Scenario #1: A scrollbar moves the enclosed text also moves Scenario #2: A window is resized components change in position and size How does this happen? Pseudo- eventsare used for widget to widget communication Pseudo because they are a responses to an implicit event (the reaction of one widget to another) Accomplished by subclassing and parent notification 22 Subclassing Parent Notification Most widgets are subclasses of other widgets Methods in superclass are overridden to handle updating the widget as well as notifying other widgets Widgets notify their parent (enclosing widget) of any changes that have occurred Parent does the right thing (e.g., ask a scrollbar for its position and move the text window) 23 24
5 Java s Layout Managers 1. BorderLayout 1. BorderLayout spec. purpose 2. FlowLayout very simple 3. GridLayout very simple 4. BoxLayout very flexible GridBagLayout very flexible CardLayout spec. purpose OverlayLayout etc. Places components in one of five regions North, South, East, West, Center Support for struts and springs Struts (YES) Can specify hgap, vgap Springs (NO) Inter-component space is fixed Support for variable intrinsic size (YES) Components expand to fill space in region BorderLayout (2) Components expand (or stretch ) to fill Expand direction space as follows North Example 5B.5 DemoBorderLayout.java usage: java DemoBorderLayout arg1 where 'arg1' = strut size in pixels West Center East South Example 5B.5 (con t) strut size=0 Example 5B.5 (con t) With struts : hgap = vgap = 10 pixels Invocation: java DemoBorderLayout 0 Invocation: java DemoBorderLayout 10 Variable intrinsic size Struts 29 30
6 2. FlowLayout Example 5B.6 Arranges components in a group, left- to- right Group alignment: left, center, right Wraps components to new line if necessary Support for struts and springs Struts(YES) Can specify hgap, vgap Springs(NO) Inter-component space is fixed Support for variable intrinsic size (NO) Component size is fixed Space is added before/after/below the entire DemoFlowLayout.java usage: java DemoFlowLayout arg1 arg2 where 'arg1' = strut size in pixels and 'arg2' is one of c = center alignment l = left alignment r = right alignment group of components to fill available space Example 5B.6 (con t) Default for FlowLayout struts : hgap = vgap = 5, alignment = center Example 5B.6 (con t) With struts : hgap = vgap = 10, alignment = right Invocation: java DemoFlowLayout 5 c Invocation: java DemoFlowLayout 10 r Fill available space before/after/below group of components GridLayout Example 5B.7 Arranges components in a rectangular grid The grid contains equal-size rectangles Support for struts and springs Struts (YES) Can specify hgap, vgap Springs (NO) Inter-component space is fixed Support for variable intrinsic size (YES) Components expand to fill rectangle 35 DemoGridLayout.java usage: java DemoGridLayout arg1 where 'arg1' = strut size in pixels 36
7 Example 5B.7 (con t) No struts Example 5B.7 (con t) With struts : hgap = vgap = 10 Invocation: java DemoGridLayout 0 Invocation: java DemoGridLayout 10 Equal-size rectangles BoxLayout Arranges components vertically or horizontally Components do not wrap Support for struts and springs Struts (YES) Can specify rigid areas Springs (YES) Can specify horizontal glue or vertical glue Support for variable intrinsic size (YES) Components expand if maximum size property is set 39 Example 5B.8 DemoBoxLayout.java usage: java DemoBoxLayout arg1 arg2 where 'arg1' is one of c = centre alignment l = left alignment r = right alignment and 'arg2' is one of e = enable struts and springs demo d = disable struts and springs demo 40 Example 5B.8 (con t) Example 5B.8 (con t) Enable struts and springs demo Invocation: java DemoBoxLayout l d Invocation: java DemoBoxLayout r d Invocation: java DemoBoxLayout c d Invocation: java DemoBoxLayout c e more Springs Struts (10 pixels) Default is left align 41 42
8 Size Control Example 5B.9 How is a component s size determined during layout and during resize operations? Three factor determining component sizes: The component s size properties (preferred, minimum, and maximum) Whether the size properties are assumed or explicitly set DemoSizeControl.java usage: java DemoSizeControl arg1 where 'arg1' specifies the layout manager as follows 1 = BorderLayout 2 = FlowLayout 3 = GridLayout 4 = BoxLayout Layout manager policies Example 5B.9 (2) Component construction and configuration BorderLayout FlowLayout JButton b1 = new JButton("Button One"); JButton b2 = new JButton("B2"); JButton b3 = new JButton("B3"); JButton b4 = new JButton("B4"); b3.setmaximumsize(b1.getpreferredsize()); GridLayout b4.setpreferredsize(new Dimension(150, 50)); b4.setmaximumsize(new Dimension(150, 50)); 45 BoxLayout Expands to maximum size when resizing 46 Default Layout Managers JPanel = FlowLayout JFrame s content pane = BorderLayout 47
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