Java SpringLayout A SpringLayout arranges the children of its associated container according to a set of constraints.Constraints are nothing but horizontal and vertical distance between two component edges. Every constrains are represented by a SpringLayout.Constraint object. Each child of a SpringLayout container, as well as the container itself, has exactly one set of constraints associated with them. Each edge position is dependent on the position of the other edge. If a constraint is added to create new edge than the previous binding is discarded. SpringLayout doesn't automatically set the location of the components it manages. Nested Classes
Modifier and Type |
Class |
Description |
static class |
SpringLayout.Constraints |
It is a Constraints object helps to govern component's size and position change in a container that is controlled by SpringLayout |
Fields
Modifier and Type |
Field |
Description |
static String |
BASELINE |
It specifies the baseline of a component. |
static String |
EAST |
It specifies the right edge of a component's bounding rectangle. |
static String |
HEIGHT |
It specifies the height of a component's bounding rectangle. |
static String |
HORIZONTAL_CENTER |
It specifies the horizontal center of a component's bounding rectangle. |
static String |
NORTH |
It specifies the top edge of a component's bounding rectangle. |
static String |
SOUTH |
It specifies the bottom edge of a component's bounding rectangle. |
static String |
VERTICAL_CENTER |
It specifies the vertical center of a component's bounding rectangle. |
static String |
WEST |
It specifies the left edge of a component's bounding rectangle. |
static String |
WIDTH |
It specifies the width of a component's bounding rectangle. |
Useful Methods
Modifier and Type |
Method |
Description |
void |
addLayoutComponent(Component component, Object constraints) |
If constraints is an instance of SpringLayout. Constraints, associates the constraints with the specified component. |
void |
addLayoutComponent(String name, Component c) |
Has no effect, since this layout manager does not use a per-component string. |
Spring |
getConstraint(String edgeName, Component c) |
It returns the spring controlling the distance between the specified edge of the component and the top or left edge of its parent. |
SpringLayout.Constraints |
getConstraints(Component c) |
It returns the constraints for the specified component. |
float |
getLayoutAlignmentX(Container p) |
It returns 0.5f (centered). |
float |
getLayoutAlignmentY(Container p) |
It returns 0.5f (centered). |
void |
invalidateLayout(Container p) |
It Invalidates the layout, indicating that if the layout manager has cached information it should be discarded. |
void |
layoutContainer(Container parent) |
It lays out the specified container. |
Dimension |
maximumLayoutSize(Container parent) |
It is used to calculates the maximum size dimensions for the specified container, given the components it contains. |
Dimension |
minimumLayoutSize(Container parent) |
It is used to calculates the minimum size dimensions for the specified container, given the components it contains. |
Dimension |
preferredLayoutSize(Container parent) |
It is used to calculates the preferred size dimensions for the specified container, given the components it contains. |
Example
Output:
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