Class CellContext

  • All Implemented Interfaces:
    Serializable
    Direct Known Subclasses:
    ListCellContext, TableCellContext, TreeCellContext

    public class CellContext
    extends Object
    implements Serializable
    Encapsulates a snapshop of cell content and default display context for usage by a ComponentProvider.

    One part is the super-set of properties that's traditionally passed into the core renderers' (Table-, List-, Tree-) getXXCellRendererComponent. Raw properties which define the context are

    • selected
    • focused
    • expanded
    • leaf
    Similarl to a ComponentAdapter, the properties are a super-set of those for a concrete component type. It's up to sub-classes (once the generics will be removed, until then the DefaultXXRenderers - PENDING JW: undecided - even after the generics removal, the param list in the subclasses are the same) fill any reasonable defaults for those not applicable to the specific component context. With those raw properties given, a CellContext looks up and returns dependent visual properties as appropriate for the concrete component. Typically, they are taken from the component if supported, or requested from the UIManager. Dependent properties are
    • foreground and background color
    • border
    • icon (relevant for trees only)
    • editable
    For a backdoor, the cell location (in horizontal and vertical view coordinates) and the originating component is accessible as well. Note that they are not necessarily valid for the "life" component. It's not recommended to actually use them. If needed, that's probably a sign the api is lacking :-)

    • PENDING: still incomplete? how about Font?
    • PENDING: protected methods? Probably need to open up - derived properties should be accessible in client code.
    Author:
    Jeanette Winzenburg
    See Also:
    Serialized Form
    • Field Summary

      Fields 
      Modifier and Type Field Description
      protected int column  
      protected JComponent component
      PENDING JW: maybe make this a WeakReference? Would be a more robust fix for Issue #1040-swingx.
      protected boolean dropOn  
      protected boolean expanded  
      protected boolean focused  
      protected boolean leaf  
      protected static Border noFocusBorder
      the default border for unfocused cells.
      protected int row  
      protected boolean selected  
      protected Object value
      PENDING JW: maybe make this a WeakReference? Would be a more robust fix for Issue #1040-swingx.
    • Constructor Summary

      Constructors 
      Constructor Description
      CellContext()  
    • Field Detail

      • noFocusBorder

        protected static Border noFocusBorder
        the default border for unfocused cells.
      • component

        protected transient JComponent component
        PENDING JW: maybe make this a WeakReference? Would be a more robust fix for Issue #1040-swingx.
      • value

        protected transient Object value
        PENDING JW: maybe make this a WeakReference? Would be a more robust fix for Issue #1040-swingx.
      • row

        protected transient int row
      • column

        protected transient int column
      • selected

        protected transient boolean selected
      • focused

        protected transient boolean focused
      • expanded

        protected transient boolean expanded
      • leaf

        protected transient boolean leaf
      • dropOn

        protected transient boolean dropOn
    • Constructor Detail

      • CellContext

        public CellContext()
    • Method Detail

      • installState

        protected void installState​(Object value,
                                    int row,
                                    int column,
                                    boolean selected,
                                    boolean focused,
                                    boolean expanded,
                                    boolean leaf)
        Sets the state of the cell's context. Convenience method for subclasses.
        Parameters:
        value - the content value of the cell
        row - the cell's row index in view coordinates
        column - the cell's column index in view coordinates
        selected - the cell's selected state
        focused - the cell's focused state
        expanded - the cell's expanded state
        leaf - the cell's leaf state
      • replaceValue

        public Object replaceValue​(Object value)
        Replaces the value of this cell context with the given parameter and returns the replaced value.
        Parameters:
        value - the new value of the cell context
        Returns:
        the replaced value of the cell context
      • getComponent

        public JComponent getComponent()
        Returns the component the cell resides on, may be null. Subclasses are expected to override and return the component type they are handling.
        Returns:
        the component the cell resides on, may be null.
      • getValue

        public Object getValue()
        Returns the value of the cell as set in the install.
        Returns:
        the content value of the cell.
      • getRow

        public int getRow()
        Returns the cell's row index in view coordinates as set in the install.
        Returns:
        the cell's row index.
      • getColumn

        public int getColumn()
        Returns the cell's column index in view coordinates as set in the install.
        Returns:
        the cell's column index.
      • isSelected

        public boolean isSelected()
        Returns the selected state as set in the install.
        Returns:
        the cell's selected state.
      • isFocused

        public boolean isFocused()
        Returns the focused state as set in the install.
        Returns:
        the cell's focused state.
      • isExpanded

        public boolean isExpanded()
        Returns the expanded state as set in the install.
        Returns:
        the cell's expanded state.
      • isLeaf

        public boolean isLeaf()
        Returns the leaf state as set in the install.
        Returns:
        the cell's leaf state.
      • isEditable

        public boolean isEditable()
        Returns the cell's editability. Subclasses should override to return a reasonable cell-related state.

        Here: false.

        Returns:
        the cell's editable property.
      • getIcon

        public Icon getIcon()
        Returns the icon. Subclasses should override to return a reasonable cell-related state.

        Here: null.

        Returns:
        the cell's icon.
      • isDropOn

        protected boolean isDropOn()
        Returns a boolean indicating if the cell is a drop location with any of the dropOn modes. It's up to subclasses to implement.

        Here: false.

        Returns:
        true if the current cell is a drop location with any of the dropOn modes, false otherwise
      • getForeground

        protected Color getForeground()
        Returns the foreground color of the renderered component or null if the component is null

        PENDING: fallback to UI properties if comp == null?

        Returns:
        the foreground color of the rendered component.
      • getBackground

        protected Color getBackground()
        Returns the background color of the renderered component or null if the component is null

        PENDING: fallback to UI properties if comp == null?

        Returns:
        the background color of the rendered component.
      • getSelectionBackground

        protected Color getSelectionBackground()
        Returns the default selection background color of the renderered component. Typically, the color is LF specific. It's up to subclasses to look it up. Here: returns null.

        PENDING: return UI properties here?

        Returns:
        the selection background color of the rendered component.
      • getSelectionForeground

        protected Color getSelectionForeground()
        Returns the default selection foreground color of the renderered component. Typically, the color is LF specific. It's up to subclasses to look it up. Here: returns null.

        PENDING: return UI properties here?

        Returns:
        the selection foreground color of the rendered component.
      • getFocusBorder

        protected Border getFocusBorder()
        Returns the default focus border of the renderered component. Typically, the border is LF specific.
        Returns:
        the focus border of the rendered component.
      • getBorder

        protected Border getBorder()
        Returns the default border of the renderered component depending on cell state. Typically, the border is LF specific.

        Here: returns the focus border if the cell is focused, the context defined no focus border otherwise.

        Returns:
        the default border of the rendered component.
      • getFocusForeground

        protected Color getFocusForeground()
        Returns the default focused foreground color of the renderered component. Typically, the color is LF specific.
        Returns:
        the focused foreground color of the rendered component.
      • getFocusBackground

        protected Color getFocusBackground()
        Returns the default focused background color of the renderered component. Typically, the color is LF specific.
        Returns:
        the focused background color of the rendered component.
      • getDropCellForeground

        protected Color getDropCellForeground()
      • getDropCellBackground

        protected Color getDropCellBackground()
      • getUIKey

        protected String getUIKey​(String key)
        Convenience method to build a component type specific lookup key for the UIManager.
        Parameters:
        key - the general part of the key
        Returns:
        a composed key build of a component type prefix and the input.
      • getUIPrefix

        protected String getUIPrefix()
        Returns the component type specific prefix of keys for lookup in the UIManager. Subclasses must override, here: returns the empty String.
        Returns:
        the component type specific prefix.
      • getFont

        protected Font getFont()
        Returns the Font of the target component or null if no component installed.
        Returns:
      • getCellRendererName

        public String getCellRendererName()