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VCAFE.3.0A
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ScrollingPanel.java
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1998-10-19
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package symantec.itools.awt;
import java.awt.Dimension;
import java.awt.Point;
import java.awt.Component;
import java.awt.Adjustable;
// 02/15/97 RKM Changed add to call setComponent
// Changed setComponent to add the component before the VBar, HBar, & cornerRect
// Removed bOsFlag and added isSolaris to OS
// Added handling of correct scrollbar width for the Mac
// 05/08/97 CAR Changed handleEvent to check that event target is either the HBar OR the VBar
// before executing a scroll. This fixed the bug where a scroll event that was
// not targeted at the VBar would cause the VBar logic to execute.
// 05/11/97 CAR Changed setComponent to not call super.removeAll and addInternalComponents.
// Replaced all calls to repaint with calls to placeComponents (except in reshape).
// Changed visibility of placeComponents from default to private.
// 05/16/97 CAR Changed scrollVerticalAbsolute and scrollHorizontalAbsolute to account for
// the visible page size
// 05/19/97 CAR Changed reshape to call placeComponents
// 05/20/97 CAR Added vendor/version check to placeComponents, scrollDown/Right/PageDown/PageRight
// 07/15/97 RKM Changed call to super.setLayout so it would bypass our override
// 07/19/97 RKM Hide components immediately after creation, instead of waiting to post add (eliminate flicker)
// Removed hard coded scrollbar size (called getPreferredSize())
// Removed add overrides and added addImpl (this is the 1.1 way of doing this)
// Changed removeAll to not call super, but remove the one component that could be there
// 07/25/97 RKM Added getScrollPosition a la ScrollPane
// 07/29/97 RKM Made bSun1_1 static
// 07/30/97 CAR marked fields transient as needed
// 08/21/97 CAR Ripped out guts of ScrollingPanel, now extend directly from java.awt.ScrollPane
// 08/30/97 LAB Deprecated class (Addresses Mac Bug #7651). Updated version to 1.1.
// 09/04/97 LAB Backed out deprecation. Interactions are more useful than baseclass.
/**
* Similar to java.awt.ScrollPane, but with better Interaction Wizard support.
* <p>
* The ScrollingPanel is a panel with automatic scroll bars.
* It may contain only one component/container/panel/etc.
* It automatically tracks the size of this (usually large) component and
* provides scroll bars so the entire component may be viewed within a
* panel of limited size.
* Typically, the added component would be a panel (or some other container)
* which would then contain a variety of other components.
*
* @see java.awt.ScrollPane
* @version 1.1, August 30, 1997
* @author Symantec
*/
public class ScrollingPanel extends java.awt.ScrollPane
{
/**
* Constructs a default ScrollingPanel.
* The panel is initialized with a null component, zero
* minimum height and zero minimum width.
*/
public ScrollingPanel()
{
super();
}
/**
* Constructs a new ScrollingPanel initialized with the
* specified scrollbarDisplayPolicy.
* @param scrollbarDisplayPolicy policy for when scrollbars should be shown
*/
public ScrollingPanel(int scrollbarDisplayPolicy)
{
super(scrollbarDisplayPolicy);
}
/**
* Constructs a new ScrollingPanel initialized with the
* specified component, minimum height and minimum width.
* @param component the component (usually a Panel) to be
* scrolled
* @param minWidth the value to be used for the minimumSize()
* width of the ScrollingPanel
* @param minHeight the value to be used for the minimumSize()
* height of the ScrollingPanel
*/
public ScrollingPanel(Component component, int minWidth, int minHeight)
{
super();
addImpl(component, null, -1);
setSize(minWidth, minHeight);
}
/**
* Sets the value to be used for the minimumSize() width
* of the ScrollingPanel.
* @param minWidth the value to be used for the minimumSize()
* width of the ScrollingPanel
* @see #getMinimumWidth
*/
public void setMinimumWidth(int minWidth)
{
this.width = minWidth;
}
/**
* Gets the current value used for the minimumSize()
* width of the ScrollingPanel.
* @return the current minimum width value
*/
public int getMinimumWidth()
{
return this.width;
}
/**
* Sets the value to be used for the minimumSize()
* height of the ScrollingPanel.
* @param minHeight the value to be used for the minimumSize()
* height of the ScrollingPanel
* @see #getMinimumHeight
*/
public void setMinimumHeight(int minHeight)
{
this.height = minHeight;
}
/**
* Gets the value used for the minimumSize() height
* of the ScrollingPanel.
* @return current minimum height value
* @see #setMinimumHeight
*/
public int getMinimumHeight()
{
return this.height;
}
/**
* @deprecated
* removed functionality
*/
public void setVerticalGap(int gapPixels)
{
}
/**
* @deprecated
* removed functionality
*/
public int getVerticalGap()
{
return 0;
}
/**
* @deprecated
* removed functionality
*/
public void setHorizontalGap(int gapPixels)
{
}
/**
* @deprecated
* removed functionality
*/
public int getHorizontalGap()
{
return 0;
}
/**
* @deprecated
* replaced by constructor which takes a scrollbarDisplayPolicy
*/
public void setShowVerticalScroll(boolean cond)
{
}
/**
* @deprecated
* replaced by getScrollbarDisplayPolicy
*/
public boolean getShowVerticalScroll()
{
int i = getScrollbarDisplayPolicy();
if (i == SCROLLBARS_ALWAYS || i == SCROLLBARS_AS_NEEDED)
return true;
else
return false;
}
/**
* @deprecated
* replaced by constructor which takes a scrollbarDisplayPolicy
*/
public void setShowHorizontalScroll(boolean cond)
{
}
/**
* @deprecated
* replaced by getScrollbarDisplayPolicy
*/
public boolean getShowHorizontalScroll()
{
int i = getScrollbarDisplayPolicy();
if (i == SCROLLBARS_ALWAYS || i == SCROLLBARS_AS_NEEDED)
return true;
else
return false;
}
/**
*/
public void setScrollLineIncrement(int scrollLineIncrement)
{
getHAdjustable().setUnitIncrement(scrollLineIncrement);
getVAdjustable().setUnitIncrement(scrollLineIncrement);
}
/**
*/
public int getScrollLineIncrement()
{
return Math.max(getHAdjustable().getUnitIncrement(),
getVAdjustable().getUnitIncrement());
}
/**
* Sets the component in this ScrollingPanel. This is the component
* that gets scrolled. The ScrollingPanel can only contain one component.
* Any previous component will be removed before the new one is added.
* @param comp the component to add
* @see #getComponent
*/
public void setComponent(Component comp)
{
addImpl(comp, null, -1);
}
/**
* Gets the current component in the ScrollingPanel.
* This is the component that gets scrolled.
* @return the current component in the ScrollingPanel
* @see #setComponent
*/
public Component getComponent()
{
if (getComponentCount() > 0) {
return getComponent(0);
}
else
return null;
}
/**
* Scrolls up by the number of pixels specified in the method setScrollLineIncrement().
* The default is one pixel.
* @see #scrollDown
* @see #scrollLeft
* @see #scrollRight
* @see #setScrollLineIncrement
* @see #getScrollLineIncrement
*/
public void scrollUp()
{
Point p = getScrollPosition();
setScrollPosition(new Point(p.x, p.y - getVAdjustable().getUnitIncrement()));
}
/**
* Scrolls left by the number of pixels specified in the method setScrollLineIncrement().
* The default is one pixel.
* @see #scrollRight
* @see #scrollUp
* @see #scrollDown
* @see #setScrollLineIncrement
* @see #getScrollLineIncrement
*/
public void scrollLeft()
{
Point p = getScrollPosition();
setScrollPosition(new Point(p.x - getHAdjustable().getUnitIncrement(), p.y));
}
/**
* Scrolls down by the number of pixels specified in the method setScrollLineIncrement().
* The default is one pixel.
* @see #scrollUp
* @see #scrollLeft
* @see #scrollRight
* @see #setScrollLineIncrement
* @see #getScrollLineIncrement
*/
public void scrollDown()
{
Point p = getScrollPosition();
setScrollPosition(new Point(p.x, p.y + getVAdjustable().getUnitIncrement()));
}
/**
* Scrolls right by the number of pixels specified in the method setScrollLineIncrement().
* The default is one pixel.
* @see #scrollLeft
* @see #scrollUp
* @see #scrollDown
* @see #setScrollLineIncrement
* @see #getScrollLineIncrement
*/
public void scrollRight()
{
Point p = getScrollPosition();
setScrollPosition(new Point(p.x + getHAdjustable().getUnitIncrement(), p.y));
}
/**
* Scrolls one "page" up.
* The page size is the size of this ScrollingPanel not including the
* scroll bar, if present.
* @see #scrollPageDown
* @see #scrollPageLeft
* @see #scrollPageRight
*/
public void scrollPageUp()
{
Point p = getScrollPosition();
setScrollPosition(new Point(p.x, p.y - getVAdjustable().getBlockIncrement()));
}
/**
* Scrolls one "page" left.
* The page size is the size of this ScrollingPanel not including the
* scroll bar, if present.
* @see #scrollPageRight
* @see #scrollPageUp
* @see #scrollPageDown
*/
public void scrollPageLeft()
{
Point p = getScrollPosition();
setScrollPosition(new Point(p.x - getHAdjustable().getBlockIncrement(), p.y));
}
/**
* Scrolls one "page" down.
* The page size is the size of this ScrollingPanel not including the
* scroll bar, if present.
* @see #scrollPageUp
* @see #scrollPageLeft
* @see #scrollPageRight
*/
public void scrollPageDown()
{
Point p = getScrollPosition();
setScrollPosition(new Point(p.x, p.y + getVAdjustable().getBlockIncrement()));
}
/**
* Scrolls one "page" right.
* The page size is the size of this ScrollingPanel not including the
* scroll bar, if present.
* @see #scrollPageLeft
* @see #scrollPageUp
* @see #scrollPageDown
*/
public void scrollPageRight()
{
Point p = getScrollPosition();
setScrollPosition(new Point(p.x + getHAdjustable().getBlockIncrement(), p.y));
}
/**
* Scrolls to an absolute vertical position.
* The contained component's given pixel position will be scrolled to the
* top line of the scrolling panel. The provided position is constrained to the range
* [0, component's height - view port height].
* @param position the pixel position to scroll to
* @see #scrollHorizontalAbsolute
*/
public void scrollVerticalAbsolute(int position)
{
Point p = getScrollPosition();
setScrollPosition(new Point(p.x, position));
}
/**
* Scrolls to an absolute horizontal position.
* The contained component's given pixel position will be scrolled to the
* leftmost part of the scrolling panel. The provided position is constrained to the range
* [0, component's width - view port width].
* @param position the pixel position to scroll to
* @see #scrollVerticalAbsolute
*/
public void scrollHorizontalAbsolute(int position)
{
Point p = getScrollPosition();
setScrollPosition(new Point(position, p.y));
}
/**
* Returns the recommended dimensions to properly display this component.
* This is a standard Java AWT method which gets called to determine
* the recommended size of this component.
*
* For each axis, it returns the larger of the current size or the
* minimum size.
*
* @see #minimumSize
*/
public Dimension preferredSize()
{
Dimension s = size();
Dimension m = minimumSize();
return new Dimension(Math.max(s.width, m.width), Math.max(s.height, m.height));
}
public Dimension getPreferredSize()
{
return preferredSize();
}
/**
* Returns the minimum dimensions to properly display this component.
* This is a standard Java AWT method which gets called to determine
* the minimum size of this component.
*
* The value returned is set using the setMinimumHeight() and
* setMinimumWidth() methods or when this ScrollingPanel is constructed.
*
* @see #preferredSize
* @see #setMinimumHeight
* @see #setMinimumWidth
*/
public Dimension minimumSize()
{
return new Dimension(width, height);
}
public Dimension getMinimumSize()
{
return minimumSize();
}
private int width = 100;
private int height = 100;
}