Package org.eclipse.swt.widgets

Class TreeItem

  • public class TreeItem
extends Item
    Instances of this class represent a selectable user interface object that represents a hierarchy of tree items in a tree widget.
    Styles:
    (none)
    Events:
    (none)

    IMPORTANT: This class is not intended to be subclassed.

    See Also:
    Tree, TreeItem, TreeColumn snippets, Sample code and further information
    Restriction:
    This class is not intended to be subclassed by clients.

    • Field Summary

      Fields 
      Modifier and Type Field Description
      long handle
      the handle to the OS resource (Warning: This field is platform dependent)

    • Constructor Summary

      Constructors 
      Constructor Description
      TreeItem​(TreeItem parentItem, int style)
      Constructs TreeItem and inserts it into Tree.
      TreeItem​(TreeItem parentItem, int style, int index)
      Constructs TreeItem and inserts it into Tree.
      TreeItem​(Tree parent, int style)
      Constructs TreeItem and inserts it into Tree.
      TreeItem​(Tree parent, int style, int index)
      Constructs TreeItem and inserts it into Tree.

    • Method Summary

      All Methods Instance Methods Concrete Methods 
      Modifier and Type Method Description
      protected void checkSubclass()
      Checks that this class can be subclassed.
      void clear​(int index, boolean all)
      Clears the item at the given zero-relative index in the receiver.
      void clearAll​(boolean all)
      Clears all the items in the receiver.
      Color getBackground()
      Returns the receiver's background color.
      Color getBackground​(int index)
      Returns the background color at the given column index in the receiver.
      Rectangle getBounds()
      Returns a rectangle describing the size and location of the receiver's text relative to its parent.
      Rectangle getBounds​(int index)
      Returns a rectangle describing the receiver's size and location relative to its parent at a column in the tree.
      boolean getChecked()
      Returns true if the receiver is checked, and false otherwise.
      boolean getExpanded()
      Returns true if the receiver is expanded, and false otherwise.
      Font getFont()
      Returns the font that the receiver will use to paint textual information for this item.
      Font getFont​(int index)
      Returns the font that the receiver will use to paint textual information for the specified cell in this item.
      Color getForeground()
      Returns the foreground color that the receiver will use to draw.
      Color getForeground​(int index)
      Returns the foreground color at the given column index in the receiver.
      boolean getGrayed()
      Returns true if the receiver is grayed, and false otherwise.
      Image getImage()
      Returns the receiver's image if it has one, or null if it does not.
      Image getImage​(int index)
      Returns the image stored at the given column index in the receiver, or null if the image has not been set or if the column does not exist.
      Rectangle getImageBounds​(int index)
      Returns a rectangle describing the size and location relative to its parent of an image at a column in the tree.
      TreeItem getItem​(int index)
      Returns the item at the given, zero-relative index in the receiver.
      int getItemCount()
      Returns the number of items contained in the receiver that are direct item children of the receiver.
      TreeItem[] getItems()
      Returns a (possibly empty) array of TreeItems which are the direct item children of the receiver.
      Tree getParent()
      Returns the receiver's parent, which must be a Tree.
      TreeItem getParentItem()
      Returns the receiver's parent item, which must be a TreeItem or null when the receiver is a root.
      String getText()
      Returns the receiver's text, which will be an empty string if it has never been set.
      String getText​(int index)
      Returns the text stored at the given column index in the receiver, or empty string if the text has not been set.
      Rectangle getTextBounds​(int index)
      Returns a rectangle describing the size and location relative to its parent of the text at a column in the tree.
      int indexOf​(TreeItem item)
      Searches the receiver's list starting at the first item (index 0) until an item is found that is equal to the argument, and returns the index of that item.
      void removeAll()
      Removes all of the items from the receiver.
      void setBackground​(int index, Color color)
      Sets the background color at the given column index in the receiver to the color specified by the argument, or to the default system color for the item if the argument is null.
      void setBackground​(Color color)
      Sets the receiver's background color to the color specified by the argument, or to the default system color for the item if the argument is null.
      void setChecked​(boolean checked)
      Sets the checked state of the receiver.
      void setExpanded​(boolean expanded)
      Sets the expanded state of the receiver.
      void setFont​(int index, Font font)
      Sets the font that the receiver will use to paint textual information for the specified cell in this item to the font specified by the argument, or to the default font for that kind of control if the argument is null.
      void setFont​(Font font)
      Sets the font that the receiver will use to paint textual information for this item to the font specified by the argument, or to the default font for that kind of control if the argument is null.
      void setForeground​(int index, Color color)
      Sets the foreground color at the given column index in the receiver to the color specified by the argument, or to the default system color for the item if the argument is null.
      void setForeground​(Color color)
      Sets the receiver's foreground color to the color specified by the argument, or to the default system color for the item if the argument is null.
      void setGrayed​(boolean grayed)
      Sets the grayed state of the checkbox for this item.
      void setImage​(int index, Image image)
      Sets the receiver's image at a column.
      void setImage​(Image image)
      Sets the receiver's image to the argument, which may be null indicating that no image should be displayed.
      void setImage​(Image[] images)
      Sets the image for multiple columns in the tree.
      void setItemCount​(int count)
      Sets the number of child items contained in the receiver.
      void setText​(int index, String string)
      Sets the receiver's text at a column
      void setText​(String string)
      Sets the receiver's text.
      void setText​(String[] strings)
      Sets the text for multiple columns in the tree.

    • Field Detail

      • handle

        public long handle
        the handle to the OS resource (Warning: This field is platform dependent)

        IMPORTANT: This field is not part of the SWT public API. It is marked public only so that it can be shared within the packages provided by SWT. It is not available on all platforms and should never be accessed from application code.

        Restriction:
        This field is not intended to be referenced by clients.

    • Constructor Detail

      • TreeItem

        public TreeItem​(Tree parent,
                int style)
        Constructs TreeItem and inserts it into Tree. Item is inserted as last direct child of the tree.

        The fastest way to insert many items is documented in TreeItem(Tree,int,int) and setItemCount(int)

        Parameters:
        parent - a tree control which will be the parent of the new instance (cannot be null)
        style - no styles are currently supported, pass SWT.NONE
        Throws:
        IllegalArgumentException -
        • ERROR_NULL_ARGUMENT - if the parent is null
        SWTException -
        • ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the parent
        • ERROR_INVALID_SUBCLASS - if this class is not an allowed subclass
        See Also:
        SWT, Widget.checkSubclass(), Widget.getStyle()

      • TreeItem

        public TreeItem​(Tree parent,
                int style,
                int index)
        Constructs TreeItem and inserts it into Tree. Item is inserted as index direct child of the tree.

        The fastest way to insert many items is:

        1. Use Tree.setRedraw(boolean) to disable drawing during bulk insert
        2. Insert every item at index 0 (insert them in reverse to get the same result)
        3. Collapse the parent item before inserting (gives massive improvement on Windows)
        Parameters:
        parent - a tree control which will be the parent of the new instance (cannot be null)
        style - no styles are currently supported, pass SWT.NONE
        index - the zero-relative index to store the receiver in its parent
        Throws:
        IllegalArgumentException -
        • ERROR_NULL_ARGUMENT - if the parent is null
        • ERROR_INVALID_RANGE - if the index is not between 0 and the number of elements in the parent (inclusive)
        SWTException -
        • ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the parent
        • ERROR_INVALID_SUBCLASS - if this class is not an allowed subclass
        See Also:
        SWT, Widget.checkSubclass(), Widget.getStyle(), Tree.setRedraw(boolean)

      • TreeItem

        public TreeItem​(TreeItem parentItem,
                int style)
        Constructs TreeItem and inserts it into Tree. Item is inserted as last direct child of the specified TreeItem.

        The fastest way to insert many items is documented in TreeItem(Tree,int,int) and setItemCount(int)

        Parameters:
        parentItem - a tree control which will be the parent of the new instance (cannot be null)
        style - no styles are currently supported, pass SWT.NONE
        Throws:
        IllegalArgumentException -
        • ERROR_NULL_ARGUMENT - if the parent is null
        SWTException -
        • ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the parent
        • ERROR_INVALID_SUBCLASS - if this class is not an allowed subclass
        See Also:
        SWT, Widget.checkSubclass(), Widget.getStyle()

      • TreeItem

        public TreeItem​(TreeItem parentItem,
                int style,
                int index)
        Constructs TreeItem and inserts it into Tree. Item is inserted as index direct child of the specified TreeItem.

        The fastest way to insert many items is documented in TreeItem(Tree,int,int) and setItemCount(int)

        Parameters:
        parentItem - a tree control which will be the parent of the new instance (cannot be null)
        style - no styles are currently supported, pass SWT.NONE
        index - the zero-relative index to store the receiver in its parent
        Throws:
        IllegalArgumentException -
        • ERROR_NULL_ARGUMENT - if the parent is null
        • ERROR_INVALID_RANGE - if the index is not between 0 and the number of elements in the parent (inclusive)
        SWTException -
        • ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the parent
        • ERROR_INVALID_SUBCLASS - if this class is not an allowed subclass
        See Also:
        SWT, Widget.checkSubclass(), Widget.getStyle(), Tree.setRedraw(boolean)

    • Method Detail

      • checkSubclass

        protected void checkSubclass()
        Description copied from class: Widget
        Checks that this class can be subclassed.

        The SWT class library is intended to be subclassed only at specific, controlled points (most notably, Composite and Canvas when implementing new widgets). This method enforces this rule unless it is overridden.

        IMPORTANT: By providing an implementation of this method that allows a subclass of a class which does not normally allow subclassing to be created, the implementer agrees to be fully responsible for the fact that any such subclass will likely fail between SWT releases and will be strongly platform specific. No support is provided for user-written classes which are implemented in this fashion.

        The ability to subclass outside of the allowed SWT classes is intended purely to enable those not on the SWT development team to implement patches in order to get around specific limitations in advance of when those limitations can be addressed by the team. Subclassing should not be attempted without an intimate and detailed understanding of the hierarchy.

        Overrides:
        checkSubclass in class Item

      • clear

        public void clear​(int index,
                  boolean all)
        Clears the item at the given zero-relative index in the receiver. The text, icon and other attributes of the item are set to the default value. If the tree was created with the SWT.VIRTUAL style, these attributes are requested again as needed.
        Parameters:
        index - the index of the item to clear
        all - true if all child items of the indexed item should be cleared recursively, and false otherwise
        Throws:
        IllegalArgumentException -
        • ERROR_INVALID_RANGE - if the index is not between 0 and the number of elements in the list minus 1 (inclusive)
        SWTException -
        • ERROR_WIDGET_DISPOSED - if the receiver has been disposed
        • ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver
        Since:
        3.2
        See Also:
        SWT.VIRTUAL, SWT.SetData

      • clearAll

        public void clearAll​(boolean all)
        Clears all the items in the receiver. The text, icon and other attributes of the items are set to their default values. If the tree was created with the SWT.VIRTUAL style, these attributes are requested again as needed.
        Parameters:
        all - true if all child items should be cleared recursively, and false otherwise
        Throws:
        SWTException -
        • ERROR_WIDGET_DISPOSED - if the receiver has been disposed
        • ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver
        Since:
        3.2
        See Also:
        SWT.VIRTUAL, SWT.SetData

      • getBackground

        public Color getBackground()
        Returns the receiver's background color.
        Returns:
        the background color
        Throws:
        SWTException -
        • ERROR_WIDGET_DISPOSED - if the receiver has been disposed
        • ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver
        Since:
        2.0

      • getBackground

        public Color getBackground​(int index)
        Returns the background color at the given column index in the receiver.
        Parameters:
        index - the column index
        Returns:
        the background color
        Throws:
        SWTException -
        • ERROR_WIDGET_DISPOSED - if the receiver has been disposed
        • ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver
        Since:
        3.1

      • getBounds

        public Rectangle getBounds()
        Returns a rectangle describing the size and location of the receiver's text relative to its parent.
        Returns:
        the bounding rectangle of the receiver's text
        Throws:
        SWTException -
        • ERROR_WIDGET_DISPOSED - if the receiver has been disposed
        • ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver

      • getBounds

        public Rectangle getBounds​(int index)
        Returns a rectangle describing the receiver's size and location relative to its parent at a column in the tree.
        Parameters:
        index - the index that specifies the column
        Returns:
        the receiver's bounding column rectangle
        Throws:
        SWTException -
        • ERROR_WIDGET_DISPOSED - if the receiver has been disposed
        • ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver
        Since:
        3.1

      • getChecked

        public boolean getChecked()
        Returns true if the receiver is checked, and false otherwise. When the parent does not have the CHECK style, return false.
        Returns:
        the checked state
        Throws:
        SWTException -
        • ERROR_WIDGET_DISPOSED - if the receiver has been disposed
        • ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver

      • getExpanded

        public boolean getExpanded()
        Returns true if the receiver is expanded, and false otherwise.

        Returns:
        the expanded state
        Throws:
        SWTException -
        • ERROR_WIDGET_DISPOSED - if the receiver has been disposed
        • ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver

      • getFont

        public Font getFont()
        Returns the font that the receiver will use to paint textual information for this item.
        Returns:
        the receiver's font
        Throws:
        SWTException -
        • ERROR_WIDGET_DISPOSED - if the receiver has been disposed
        • ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver
        Since:
        3.0

      • getFont

        public Font getFont​(int index)
        Returns the font that the receiver will use to paint textual information for the specified cell in this item.
        Parameters:
        index - the column index
        Returns:
        the receiver's font
        Throws:
        SWTException -
        • ERROR_WIDGET_DISPOSED - if the receiver has been disposed
        • ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver
        Since:
        3.1

      • getForeground

        public Color getForeground()
        Returns the foreground color that the receiver will use to draw.
        Returns:
        the receiver's foreground color
        Throws:
        SWTException -
        • ERROR_WIDGET_DISPOSED - if the receiver has been disposed
        • ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver
        Since:
        2.0

      • getForeground

        public Color getForeground​(int index)
        Returns the foreground color at the given column index in the receiver.
        Parameters:
        index - the column index
        Returns:
        the foreground color
        Throws:
        SWTException -
        • ERROR_WIDGET_DISPOSED - if the receiver has been disposed
        • ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver
        Since:
        3.1

      • getGrayed

        public boolean getGrayed()
        Returns true if the receiver is grayed, and false otherwise. When the parent does not have the CHECK style, return false.
        Returns:
        the grayed state of the checkbox
        Throws:
        SWTException -
        • ERROR_WIDGET_DISPOSED - if the receiver has been disposed
        • ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver

      • getItem

        public TreeItem getItem​(int index)
        Returns the item at the given, zero-relative index in the receiver. Throws an exception if the index is out of range.
        Parameters:
        index - the index of the item to return
        Returns:
        the item at the given index
        Throws:
        IllegalArgumentException -
        • ERROR_INVALID_RANGE - if the index is not between 0 and the number of elements in the list minus 1 (inclusive)
        SWTException -
        • ERROR_WIDGET_DISPOSED - if the receiver has been disposed
        • ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver
        Since:
        3.1

      • getItemCount

        public int getItemCount()
        Returns the number of items contained in the receiver that are direct item children of the receiver.
        Returns:
        the number of items
        Throws:
        SWTException -
        • ERROR_WIDGET_DISPOSED - if the receiver has been disposed
        • ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver

      • getItems

        public TreeItem[] getItems()
        Returns a (possibly empty) array of TreeItems which are the direct item children of the receiver.

        Note: This is not the actual structure used by the receiver to maintain its list of items, so modifying the array will not affect the receiver.

        Returns:
        the receiver's items
        Throws:
        SWTException -
        • ERROR_WIDGET_DISPOSED - if the receiver has been disposed
        • ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver

      • getImage

        public Image getImage()
        Description copied from class: Item
        Returns the receiver's image if it has one, or null if it does not.
        Overrides:
        getImage in class Item
        Returns:
        the receiver's image

      • getImage

        public Image getImage​(int index)
        Returns the image stored at the given column index in the receiver, or null if the image has not been set or if the column does not exist.
        Parameters:
        index - the column index
        Returns:
        the image stored at the given column index in the receiver
        Throws:
        SWTException -
        • ERROR_WIDGET_DISPOSED - if the receiver has been disposed
        • ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver
        Since:
        3.1

      • getImageBounds

        public Rectangle getImageBounds​(int index)
        Returns a rectangle describing the size and location relative to its parent of an image at a column in the tree.
        Parameters:
        index - the index that specifies the column
        Returns:
        the receiver's bounding image rectangle
        Throws:
        SWTException -
        • ERROR_WIDGET_DISPOSED - if the receiver has been disposed
        • ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver
        Since:
        3.1

      • getParent

        public Tree getParent()
        Returns the receiver's parent, which must be a Tree.
        Returns:
        the receiver's parent
        Throws:
        SWTException -
        • ERROR_WIDGET_DISPOSED - if the receiver has been disposed
        • ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver

      • getParentItem

        public TreeItem getParentItem()
        Returns the receiver's parent item, which must be a TreeItem or null when the receiver is a root.
        Returns:
        the receiver's parent item
        Throws:
        SWTException -
        • ERROR_WIDGET_DISPOSED - if the receiver has been disposed
        • ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver

      • getText

        public String getText()
        Description copied from class: Item
        Returns the receiver's text, which will be an empty string if it has never been set.
        Overrides:
        getText in class Item
        Returns:
        the receiver's text

      • getText

        public String getText​(int index)
        Returns the text stored at the given column index in the receiver, or empty string if the text has not been set.
        Parameters:
        index - the column index
        Returns:
        the text stored at the given column index in the receiver
        Throws:
        SWTException -
        • ERROR_WIDGET_DISPOSED - if the receiver has been disposed
        • ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver
        Since:
        3.1

      • getTextBounds

        public Rectangle getTextBounds​(int index)
        Returns a rectangle describing the size and location relative to its parent of the text at a column in the tree.
        Parameters:
        index - the index that specifies the column
        Returns:
        the receiver's bounding text rectangle
        Throws:
        SWTException -
        • ERROR_WIDGET_DISPOSED - if the receiver has been disposed
        • ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver
        Since:
        3.3

      • indexOf

        public int indexOf​(TreeItem item)
        Searches the receiver's list starting at the first item (index 0) until an item is found that is equal to the argument, and returns the index of that item. If no item is found, returns -1.
        Parameters:
        item - the search item
        Returns:
        the index of the item
        Throws:
        IllegalArgumentException -
        • ERROR_NULL_ARGUMENT - if the item is null
        • ERROR_INVALID_ARGUMENT - if the item has been disposed
        SWTException -
        • ERROR_WIDGET_DISPOSED - if the receiver has been disposed
        • ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver
        Since:
        3.1

      • removeAll

        public void removeAll()
        Removes all of the items from the receiver.
        Throws:
        SWTException -
        • ERROR_WIDGET_DISPOSED - if the receiver has been disposed
        • ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver
        Since:
        3.1

      • setBackground

        public void setBackground​(Color color)
        Sets the receiver's background color to the color specified by the argument, or to the default system color for the item if the argument is null.
        Parameters:
        color - the new color (or null)
        Throws:
        IllegalArgumentException -
        • ERROR_INVALID_ARGUMENT - if the argument has been disposed
        SWTException -
        • ERROR_WIDGET_DISPOSED - if the receiver has been disposed
        • ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver
        Since:
        2.0

      • setBackground

        public void setBackground​(int index,
                          Color color)
        Sets the background color at the given column index in the receiver to the color specified by the argument, or to the default system color for the item if the argument is null.
        Parameters:
        index - the column index
        color - the new color (or null)
        Throws:
        IllegalArgumentException -
        • ERROR_INVALID_ARGUMENT - if the argument has been disposed
        SWTException -
        • ERROR_WIDGET_DISPOSED - if the receiver has been disposed
        • ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver
        Since:
        3.1

      • setChecked

        public void setChecked​(boolean checked)
        Sets the checked state of the receiver.

        Parameters:
        checked - the new checked state
        Throws:
        SWTException -
        • ERROR_WIDGET_DISPOSED - if the receiver has been disposed
        • ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver

      • setExpanded

        public void setExpanded​(boolean expanded)
        Sets the expanded state of the receiver.

        Parameters:
        expanded - the new expanded state
        Throws:
        SWTException -
        • ERROR_WIDGET_DISPOSED - if the receiver has been disposed
        • ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver

      • setFont

        public void setFont​(Font font)
        Sets the font that the receiver will use to paint textual information for this item to the font specified by the argument, or to the default font for that kind of control if the argument is null.
        Parameters:
        font - the new font (or null)
        Throws:
        IllegalArgumentException -
        • ERROR_INVALID_ARGUMENT - if the argument has been disposed
        SWTException -
        • ERROR_WIDGET_DISPOSED - if the receiver has been disposed
        • ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver
        Since:
        3.0

      • setFont

        public void setFont​(int index,
                    Font font)
        Sets the font that the receiver will use to paint textual information for the specified cell in this item to the font specified by the argument, or to the default font for that kind of control if the argument is null.
        Parameters:
        index - the column index
        font - the new font (or null)
        Throws:
        IllegalArgumentException -
        • ERROR_INVALID_ARGUMENT - if the argument has been disposed
        SWTException -
        • ERROR_WIDGET_DISPOSED - if the receiver has been disposed
        • ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver
        Since:
        3.1

      • setForeground

        public void setForeground​(Color color)
        Sets the receiver's foreground color to the color specified by the argument, or to the default system color for the item if the argument is null.
        Parameters:
        color - the new color (or null)
        Throws:
        IllegalArgumentException -
        • ERROR_INVALID_ARGUMENT - if the argument has been disposed
        SWTException -
        • ERROR_WIDGET_DISPOSED - if the receiver has been disposed
        • ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver
        Since:
        2.0

      • setForeground

        public void setForeground​(int index,
                          Color color)
        Sets the foreground color at the given column index in the receiver to the color specified by the argument, or to the default system color for the item if the argument is null.
        Parameters:
        index - the column index
        color - the new color (or null)
        Throws:
        IllegalArgumentException -
        • ERROR_INVALID_ARGUMENT - if the argument has been disposed
        SWTException -
        • ERROR_WIDGET_DISPOSED - if the receiver has been disposed
        • ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver
        Since:
        3.1

      • setGrayed

        public void setGrayed​(boolean grayed)
        Sets the grayed state of the checkbox for this item. This state change only applies if the Tree was created with the SWT.CHECK style.
        Parameters:
        grayed - the new grayed state of the checkbox
        Throws:
        SWTException -
        • ERROR_WIDGET_DISPOSED - if the receiver has been disposed
        • ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver

      • setImage

        public void setImage​(Image[] images)
        Sets the image for multiple columns in the tree.
        Parameters:
        images - the array of new images
        Throws:
        IllegalArgumentException -
        • ERROR_NULL_ARGUMENT - if the array of images is null
        • ERROR_INVALID_ARGUMENT - if one of the images has been disposed
        SWTException -
        • ERROR_WIDGET_DISPOSED - if the receiver has been disposed
        • ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver
        Since:
        3.1

      • setImage

        public void setImage​(int index,
                     Image image)
        Sets the receiver's image at a column.
        Parameters:
        index - the column index
        image - the new image
        Throws:
        IllegalArgumentException -
        • ERROR_INVALID_ARGUMENT - if the image has been disposed
        SWTException -
        • ERROR_WIDGET_DISPOSED - if the receiver has been disposed
        • ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver
        Since:
        3.1

      • setImage

        public void setImage​(Image image)
        Description copied from class: Item
        Sets the receiver's image to the argument, which may be null indicating that no image should be displayed.
        Overrides:
        setImage in class Item
        Parameters:
        image - the image to display on the receiver (may be null)

      • setItemCount

        public void setItemCount​(int count)
        Sets the number of child items contained in the receiver.

        The fastest way to insert many items is:

        1. Use Tree.setRedraw(boolean) to disable drawing during bulk insert
        2. Collapse the parent item before inserting (gives massive improvement on Windows)
        Parameters:
        count - the number of items
        Throws:
        SWTException -
        • ERROR_WIDGET_DISPOSED - if the receiver has been disposed
        • ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver
        Since:
        3.2

      • setText

        public void setText​(String[] strings)
        Sets the text for multiple columns in the tree.

        Note: If control characters like '\n', '\t' etc. are used in the string, then the behavior is platform dependent.

        Parameters:
        strings - the array of new strings
        Throws:
        IllegalArgumentException -
        • ERROR_NULL_ARGUMENT - if the text is null
        SWTException -
        • ERROR_WIDGET_DISPOSED - if the receiver has been disposed
        • ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver
        Since:
        3.1

      • setText

        public void setText​(int index,
                    String string)
        Sets the receiver's text at a column

        Note: If control characters like '\n', '\t' etc. are used in the string, then the behavior is platform dependent.

        Parameters:
        index - the column index
        string - the new text
        Throws:
        IllegalArgumentException -
        • ERROR_NULL_ARGUMENT - if the text is null
        SWTException -
        • ERROR_WIDGET_DISPOSED - if the receiver has been disposed
        • ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver
        Since:
        3.1

      • setText

        public void setText​(String string)
        Description copied from class: Item
        Sets the receiver's text.

        Note: If control characters like '\n', '\t' etc. are used in the string, then the behavior is platform dependent.

        Overrides:
        setText in class Item
        Parameters:
        string - the new text