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java.lang.Objectnet.rim.device.api.ui.Field
net.rim.device.api.ui.ScrollView
net.rim.device.api.ui.Manager
net.rim.device.api.ui.container.VerticalFieldManager
public class VerticalFieldManager
A manager that lays out fields in a single, vertical column.
Behaviour
A vertical field manager lays out fields top to bottom in a single
column. You can build this manager with Manager.HORIZONTAL_SCROLL to
accommodate fields wider than the manager's visible frame; you
can build this manager with Manager.VERTICAL_SCROLL to accommodate
collections of fields taller than the manager's visible frame.
| Field Summary |
|---|
| Fields inherited from class net.rim.device.api.ui.Manager |
|---|
BOTTOMMOST, DOWNWARD, HORIZONTAL_SCROLL, HORIZONTAL_SCROLLBAR, HORIZONTAL_SCROLLBAR_MASK, HORIZONTAL_SCROLL_MASK, LEAVE_BLANK_SPACE, LEFTMOST, LEFTWARD, NO_HORIZONTAL_SCROLL, NO_HORIZONTAL_SCROLLBAR, NO_SCROLL_RESET, NO_VERTICAL_SCROLL, NO_VERTICAL_SCROLLBAR, QUANTA_FONT, RIGHTMOST, RIGHTWARD, TOPMOST, UPWARD, VERTICAL_SCROLL, VERTICAL_SCROLLBAR, VERTICAL_SCROLLBAR_MASK, VERTICAL_SCROLL_MASK |
| Constructor Summary | ||
|---|---|---|
VerticalFieldManager()
Constructs a new vertical field manager. |
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VerticalFieldManager(long style)
Constructs a new vertical field manager with provided style. |
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| Method Summary | ||
|---|---|---|
int |
getFieldAtLocation(int x,
int y)
Retrieves field under a particular point. |
|
int |
getPreferredHeight()
Retrieves the manager's preferred height (in pixels). |
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int |
getPreferredWidth()
Retrieves the manager's preferred width (in pixels). |
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protected int |
nextFocus(int direction,
int axis)
Retrieves the index of the next field that should be given focus. |
|
protected void |
sublayout(int maxWidth,
int maxHeight)
Lays out this manager's controlled fields. |
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protected void |
subpaint(Graphics graphics)
Redraws this manager's controlled fields. |
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| Methods inherited from class net.rim.device.api.ui.ScrollView |
|---|
configurationChanged, getHorizontalAdjustment, getVerticalAdjustment, getVisibleHeight, getVisibleWidth, onDisplay, onExposed, onUndisplay, setCurrentLocation, setExtent, setHorizontalAdjustment, setHorizontalScroll, setHorizontalScroll, setScrollListener, setVerticalAdjustment, setVerticalScroll, setVerticalScroll, valueChanged, waitForScrolling |
| Methods inherited from class java.lang.Object |
|---|
equals, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait |
| Constructor Detail |
|---|
public VerticalFieldManager()
public VerticalFieldManager(long style)
style - Styles(s) for this manager (can be Manager.VERTICAL_SCROLL
and/or Manager.HORIZONTAL_SCROLL).| Method Detail |
|---|
public int getPreferredHeight()
This method returns the height (in pixels) required to lay out the manager’s contents. It includes the preferred heights for the controlled fields, as well as spacing between these fields. Spacing between neighboring fields is defined by the largest of each field’s margins.

getPreferredHeight in class Fieldpublic int getPreferredWidth()
This method returns the width (in pixels) required to lay out the manager’s contents. The contents width is defined by the widest of controlled fields and its margins.

getPreferredWidth in class Field
protected int nextFocus(int direction,
int axis)
This method is called by the framework during a trackball focus move operation.
The direction parameter indicates the direction in which the focus is moving: a value of 1 indicates that the focus is moving forward (generally down and to the right), while a value of -1 indicates that the focus is moving backwards (generally up and to the left).
The axis parameter indicates which axis of movement the direction is in.
This can be one of Field.AXIS_SEQUENTIAL, Field.AXIS_HORIZONTAL
or Field.AXIS_VERTICAL.
VerticalFieldManager will move focus out of the manager in the event of AXIS_HORIZONTAL movement.
nextFocus in class Managerdirection - Direction the focus is moving within the field.axis - The axis of movement.
IllegalArgumentException - If direction parameter is a value other than 1 or -1.
protected void sublayout(int maxWidth,
int maxHeight)
The framework invokes this method to direct this manager to lay out its controlled fields.
sublayout in class ManagermaxWidth - Width available for layout.maxHeight - Height available for layout.protected void subpaint(Graphics graphics)
The framework invokes this method to direct this manager to repaint its controlled fields. This method examines the clipping rectangle contained in the graphics context parameter to determine which controlled fields are in the invalid region (require repainting), in order to prevent unnecessary redraws.
subpaint in class Managergraphics - Graphics context used for the redraw operation.
public int getFieldAtLocation(int x,
int y)
Given a point in coordinates to this manager's extent, this method returns the index of the controlled field under that point.
If no field exists under the point you specify, this method returns -1.
If you provide a coordinate outside this manager's extent, this method uses values along the edges of the extent as required.
This method performs a binary search.
getFieldAtLocation in class Managerx - Distance from left edge of this manager's extent.y - Distance from top edge of this manager's extent.
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