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Java Swing - O Reilly Returns the child View containing the given point. The Rectangle gives the parent’s allocation and should be changed to the child’s allocation on exit. protected abstract boolean isAfter(int x, int y, Rectangle alloc) Returns true if the given point is located after the given Rectangle. “After” is typically defined as being to the right or below. protected abstract boolean isBefore(int x, int y, Rectangle alloc) Returns true is the given point is located before the given Rectangle. “Before” is typically defined as being to the left or above. 23.2.13 The BoxView Class This is a subclass of CompositeView that arranges its children in a box along one axis. The StyledEditorKit uses BoxView to represent its top-level section element. This provides a convenient mechanism for grouping together the paragraphs of a document; each paragraph is represented by a ParagraphView, which is a child of the BoxView. 23.2.13.1 Properties The BoxView class defines two new properties and modifies the implementation of several CompositeView properties shown in Table 23.11. See the description of View properties for details on these properties. The alignment property for the axis being tiled will be 0.5. For the other axis, the alignment is based on the alignment and span of the children. Table 23.11, BoxView Properties Property Data Type get is set bound Default Value alignment (indexed)* float element* Element From constructor height int preferredSpan (indexed)* float resizeWeight (indexed)* int From children width int See also properties from the CompositeView class (Table 23.5). Figure 23.12. BoxView alignment Figure 23.12 shows a BoxView with three children. Inside each child, we show its alignment and preferredSpan. The first child has a preferred span of 10 and an alignment of 0.5, indicating that it should be centered relative to the box’s baseline. The second child also has a span of 10, but its alignment is 0.8, indicating that 80% of the view should be above the baseline. The last child has a span of just 5 and an alignment of 0.2, indicating that 80% of this view should be below the - 775
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Java Swing - O Reilly Return the insets set by a call to setInsets() or setParagraphInsets() (both are defined later). These values reflect the amount of blank space to be displayed on a given side of the view. protected Rectangle getInsideAllocation(Shape a) Returns a Rectangle created by taking the bounds of the given Shape and subtracting any insets defined for this view. protected View getViewAtPosition(int pos, Rectangle a) Returns the child View containing the given model position. The given Rectangle gives the parent’s allocation and is changed to the child’s allocation on exit. protected void loadChildren(ViewFactory f ) Initializes the View by loading its children. The default implementation iterates over the child Elements contained by the View’s Element (if there are any) and uses the given factory to create a new View for each Element. protected final void setInsets(short top, short left, short bottom, short right) Sets the View’s insets. protected final void setParagraphInsets(AttributeSet attr) Sets the View’s insets from the given AttributeSet. The attribute keys SpaceAbove, SpaceBelow, LeftIndent, and RightIndent (defined in StyleConstants) are queried. 23.2.12.6 Abstract Protected Methods The following methods are not implemented in CompositeView and must be implemented by any concrete subclass. protected abstract void childAllocation(int index, Rectangle a) Modifies the given Rectangle a to reflect the allocation for a specified child. The Rectangle specifies the View’s allocation on input and should contain the result on exit. Figure 23.11 shows how this should work for a composite view with three children. We see that r0 is passed in, but this rectangle is modified to contain the bounds of r2 on exit. Figure 23.11. Computing the allocation for child[1] protected abstract View getViewAtPoint(int x, int y, Rectangle alloc) - 774
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Java Swing - O Reilly The following methods override the default implementations provided by View: public Shape getChildAllocation(int index, Shape a) Gets the Shape’s bounding Rectangle and calls childAllocation() (see list of abstract, protected methods) returning the resulting Rectangle. public Shape modelToView(int pos, Shape a, Position.bias b) throws BadLocationException Determines which one of the view’s children contains the specified model position and passes the call on to that child. public int viewToModel( float x, float y, Shape a, Position.bias[] bias) Determines which one of the view’s children contains the specified view location and passes the call on to that child. 23.2.12.4 New Public Methods These methods are new to the CompositeView class. The first three are implemented by calling the fourth, replace(). public void append(View v) Adds a new View to the end of the list of contained Views. The parent of v is set to this composite view. public void insert(int offs, View v) Inserts a new View at the specified child index. The parent of v is set to this composite view. public void removeAll() Removes all child Views. The parent of each is set to null. public void replace(int offset, int length, View views[]) Replaces the specified range of Views with the given array of Views. The parent of any removed View is set to null. The parent of any added View is set to this composite view. 23.2.12.5 Protected Methods CompositeView defines quite a few protected methods for working with the view’s children: protected final short getBottomInset() protected final short getLeftInset() protected final short getRightInset() protected final short getTopInset() - 773
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Java Swing - O Reilly Returns a Rectangle with width=0, located at the given Shape’s location with the shape’s height. If the given position is not covered by this View, null is returned. The b parameter is currently ignored. public void paint(Graphics g, Shape a) Calls paintIcon() on the View’s icon, passing in the View’s Container, the given Graphics, and the x/y coordinates of the given Shape. public void setSize( float width, float height) Since Icons do not support resizing, this method does nothing. public int viewToModel( float x, float y, Shape a, Position.Bias[] bias) Returns the View’s start offset, which comes from the Element with which it was constructed, since Elements containing Icons are always only one “character” long. bias[0] is set to the appropriate value base on which half of the given Shape the x parameter falls in. 23.2.12 The CompositeView Class This abstract class allows Views to be grouped and referenced as a single View. This is a classic use of the Composite design pattern. CompositeViews are used to render nonleaf nodes. The View’s children correspond to the Element’s children. 23.2.12.1 Properties The CompositeView class modifies the implementation of the View properties shown in Table 23.10. See the description of View properties for details on these properties. The setParent() method is overridden to call super.setParent() and then loadChildren() (a protected method described later) to set up its child views. Since CompositeView supports child views, the view and viewCount properties are implemented to track an initially empty array of Views. The element property is set in the constructor. Table 23.10, CompositeView Properties Property Data Type get is set bound Default Value element* Element From constructor parent* View null view (indexed)* View null viewCount* int 0 See also properties from the View class (Table 23.2). 23.2.12.2 Constructors public CompositeView(Element elem) Creates a View to represent the given Element. The View initially has zero children. Child views are not added until setParent() is called. 23.2.12.3 View Methods - 772
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Java Swing - O Reilly Paints the Component. This implementation just sets the bounds of the Component based on the bounds of the given Shape, and ensures that the component is visible. The actual painting of the Component will occur as a result of it being a child of some Container. public void setSize( float width, float height) Converts the given arguments to integers and calls setSize() on the Component. public int viewToModel( float x, float y, Shape a, Position.Bias[] bias) Returns the View’s start offset, which comes from the Element it was constructed, since Elements containing Components are always only one “character” long. bias[0] is set to the appropriate value based on which half of the given Shape the x parameter falls in. 23.2.11 The IconView Class This class can be used to embed Icons into the view hierarchy. Just as we saw with Components, a single Element in a Document is used to represent the Icon, and a single IconView object is responsible for rendering the Element. 23.2.11.1 Properties The IconView class modifies the implementation of the View properties, shown in Table 23.9. See the description of View properties for details on these properties. In IconView, the alignment property is defined as 1 for the Y_AXIS (align with the bottom of the Icon). The X_AXIS alignment defaults to the value returned by View (0.5). The preferredSpan is simply the width and height of the Icon. The element property must be specified in the constructor. Table 23.9, IconView Properties Property Data Type get is set bound Default Value alignment (indexed)* float Y_AXIS: 1, X_AXIS: 0.5 element* Element From constructor preferredSpan (indexed)* float From Icon dimensions See also properties from the View class (Table 23.2). 23.2.11.2 Constructors public IconView(Element elem) This constructor creates a View for the given Element. It expects to get a valid Icon from the given element’s attribute set. 23.2.11.3 Methods ComponentView implements the three abstract methods defined in View, as well as setSize(), which had an empty implementation in View. public Shape modelToView(int pos, Shape a, Position.Bias b) throws BadLocationException - 771
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Java Swing - O Reilly Used to update several cached values based on the view’s current attributes (which it gets from getAttributes()). protected void setUnderline(boolean u) Used by setPropertiesFromAttributes() to indicate whether or not the text displayed by this view is underlined. 23.2.10 The ComponentView Class This class can be used to embed AWT Components into the view hierarchy. As we saw in a previous chapter, a single Element in a Document can be used to represent a Component. A single ComponentView object is responsible for rendering such an Element. 23.2.10.1 Properties The ComponentView class modifies the implementation of the View properties shown in Table 23.8. See the description of View properties for details on these properties. In ComponentView, the alignment property is taken from the Component’s response to getAlignmentX() and getAlignmentY() calls. Similarly, preferredSpan is determined based on the preferredSize of the Component. The implementation of setParent() actually causes the Component to be added (or removed if the parent is set to null) as a child of the view’s Container. The element property must be specified in the constructor. Table 23.8, ComponentView Properties Property Data Type get is set bound Default Value alignment (indexed)* float From Componentelement* Element From constructor parent* View null preferredSpan (indexed)* float From preferredSizeof Component See also properties from the View class (Table 23.2). 23.2.10.2 Constructor public ComponentView(Element elem) Creates a View for the given Element. It expects to get a valid Component from the given element’s attribute set. The component is initially invisible. 23.2.10.3 Methods ComponentView implements the three abstract methods defined in View, as well as setSize(), which had an empty implementation in View. public Shape modelToView(int pos, Shape a, Position.Bias b) throws BadLocationException Returns a Rectangle with width=0 located at the given Shape’s location with the shape’s height. If the given position is not covered by this View, null is returned. The b parameter is currently ignored. public void paint(Graphics g, Shape a) - 770
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Java Swing - O Reilly public int getBreakWeight(int axis, float pos, float len) If the given axis is Y_AXIS, this method delegates to the superclass. For X_AXIS, the result will be BadBreakWeight, GoodBreakWeight, or ExcellentBreakWeight, according to Table 23.7. Table 23.7, LabelView Break Weights Result Description BadBreakWeight The requested end index is the same as the start index GoodBreakWeight There is no whitespace in the requested range ExcellentBreakWeight There is whitespace in the requested range public Shape modelToView(int pos, Shape a, int p0, int p1) throws BadLocationException Returns a Rectangle covering the position pos in the Document. The width is always 0, and the height is always the height of the font in use at this position. The p0 and p1 parameters restrict the range in which pos should be searched. public Shape modelToView(int pos, Shape a, Position.Bias b) throws BadLocationException This version returns modelToView(pos, a, getStartOffset(), getEndOffset()), currently ignoring b. public void paint(Graphics g, Shape a) Uses Utilities.drawTabbedText() to draw the text to the given Graphics, using the appropriate font and color (as specified in the Element’s attributes). It uses Graphics.drawLine() to underline the text if the underline attribute has been set. public int viewToModel( float x, float y, Shape a, int p0, int p1) Calculates the model offset closest to the given location (only the left edge of the given Shape is taken into account). The p0 and p1 parameters are document offsets used to restrict the search range. public int viewToModel(float x, float y, Shape a, Position.Bias[] biasReturn) This version returns viewToModel(x, y, a, getStartOffset(), getEndOffset()). Currently, biasReturn[0] is always set to Position. Bias.Forward. 23.2.9.5 Protected Methods protected void setPropertiesFromAttributes() - 769
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Java Swing - O Reilly Returns the width of the given document range of text, using the getTabbedTextWidth() method in the Utilities class. public float getTabbedSpan( float x, TabExpander e) Returns the desired span for this view, starting at the given x-coordinate, using the specified TabExpander. 23.2.9.4 Other Public Methods public View breakView(int axis, int p0, float pos, float len) Attempts to break the View at the whitespace character closest to the requested length from the given starting point. It returns a new View object (an instance of an inner class), representing a portion of this LabelView. The current LabelView is not affected. The method returns this if the given axis is not X_AXIS. Figure 23.9. Breaking a view example Figure 23.9 shows how this might work. In this example, the goal is to break the View, starting at model position 27 (the “b” in “but”), which will be at the beginning of a line (pos= 0). We want a new View that is about 182 points long. The breakView() method takes all of this into account and returns a new View containing a portion of the original view, broken on the first whitespace it finds prior to the requested endpoint. public void changedUpdate(DocumentEvent e, Shape a, ViewFactory f ) Indicates that the Document’s attributes have changed for an area of the Document for which this View is responsible. It sets a flag so that other methods will synchronize with the Document before doing things such as painting the View. public View createFragment(int p0, int p1) Returns a new View that represents a portion of the current View, bound by the specified model endpoints. When a LabelView becomes too long to fit on a single line, it is replaced by two LabelView.LabelFragments (a nonpublic inner class), as shown in Figure 23.10. Figure 23.10. LabelView split into two LabelView.LabelFragments - 768
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Java Swing - O Reilly 23.2.9 The LabelView Class This View subclass is used to display a section of text with common attributes. A LabelView [3] is responsible for painting an Element from a StyledDocument. However, as we’ll see later (Figure 23.10), if the view does not fit on a single line, it is actually replaced by multiple LabelView.LabelFragment objects, which are together responsible for painting the single Element. [3] Despite the somewhat misleading name, LabelView has nothing to do with rendering JLabels or even simple text fields. LabelView supports intelligent breaking of views to allow breaks to occur on word boundaries. It implements the TabableView interface, reflecting the fact that the text it represents may contain tabs. In order for tabs to be rendered correctly, LabelViews must be embedded in views that implement TabExpander such as ParagraphView. 23.2.9.1 Properties The LabelView class modifies the implementation of the View properties shown in Table 23.6. See the description of View properties for details on these properties. The Y_AXIS alignment is defined as (height-descent)/height for the current font. In other words, LabelViews are aligned along their baselines (see Figure 23.8). X_AXIS alignment is delegated to the superclass. The X_AXIS preferredSpan is the width of the text to be displayed, computed using Utilities.getTabbedTextWidth(). The Y_AXIS preferredSpan is just the height of the font currently in use. Table 23.6, LabelView Properties Property Data Type get is set bound Default Value alignment (indexed)* float element* Element From constructor preferredSpan (indexed)* float From Icon dimensions See also properties from the View class (Table 23.2). Figure 23.8. LabelView y-axis alignment The element property is set in the constructor. 23.2.9.2 Constructor public LabelView(Element elem) Creates a View for the given Element. 23.2.9.3 TabableView Methods The following methods satisfy the TabableView interface implemented by this class: public float getPartialSpan(int p0, int p1) - 767
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Java Swing - O Reilly protected FontMetrics getFontMetrics() Returns the FontMetrics for the Font in use by the View’s Container. 23.2.8 The PasswordView Class PasswordView extends FieldView to render text using the JPasswordField’s echo character. If the component using this view is not a JPasswordField, it will not render anything. 23.2.8.1 Properties PasswordView does not modify any of the properties defined by its superclass, FieldView. The element property is set in the constructor. 23.2.8.2 Constructors public PasswordView(Element elem) Creates a new View for the given Element. 23.2.8.3 Protected Methods The only methods defined in this class are two protected methods called by FieldView’s paint() method and a third used by both of the others. As with FieldView, the x and y coordinates are view coordinates, while p0 and p1 are offsets in the Element being displayed. protected int drawEchoCharacter(Graphics g, int x, int y, char c) Draws the given character at the specified location. It returns the x-coordinate of the next character to be drawn (i.e., x plus the width of c). protected int drawSelectedText(Graphics g, int x, int y, int p0, int p1)throws BadLocationException Draws the specified range of selected text using drawEchoCharacter() to draw each character in the component’s selected text color. If the view’s container is not a JPasswordField, nothing is drawn. protected int drawUnselectedText(Graphics g, int x, int y, int p0, int p1)throws BadLocationException Draws the specified range of unselected text, using drawEchoCharacter() to draw each character in the component’s foreground color. If the view’s container is not a JPasswordField, nothing is drawn. - 766
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