#29 LayoutConstraints and BorderLayoutManager

[Thomas Jancar]

Since the BorderLayoutManager creates its own BorderLayoutConstraints, this subclass should inherit from DefaultLayoutManager.DefaultLayoutConstraints.

When you do something like that:

BorderLayoutManager layout = new BorderLayoutManager();
[.. (bindToContainer, create Label, ...) ]
layout.addWidget(label, BorderLayoutManager.CENTER, ...);

a RuntimeException will be thrown:

Exception in thread "main" java.lang.RuntimeException: unknown constraint: jcurses.widgets.BorderLayoutConstraint
at jcurses.widgets.DefaultLayoutManager.layout(DefaultLayoutManager.java:33)
at jcurses.widgets.WidgetContainer.packChild(WidgetContainer.java:89)
at jcurses.widgets.WidgetContainer.pack(WidgetContainer.java:101)
at jcurses.widgets.WidgetContainer.pack(WidgetContainer.java:103)
at jcurses.widgets.Window.pack(Window.java:520)
at jcurses.widgets.Window.setVisible(Window.java:141)
at jcurses.widgets.Window.show(Window.java:120)
[..]

A quick look in the source code shows, that BorderLayoutManager.BorderLayoutConstraints inherit only from Object. But in DefaultLayoutManager.java:33 it is required, that the Constraints inherit from DefaultLayoutConstraints.

jcurses: 0.9.5b
Debian Linux x64

[Thomas Jancar]

• Description has changed:

Diff:

--- old
+++ new
@@ -1,4 +1,4 @@
-Since the BorderLayoutManager creates its own BorderLayoutConstraints, this subclass should inherit form DefaultLayoutManager.DefaultLayoutConstraints.
+Since the BorderLayoutManager creates its own BorderLayoutConstraints, this subclass should inherit from DefaultLayoutManager.DefaultLayoutConstraints.

 When you do something like that:

@@ -6,7 +6,7 @@
 [.. (bindToContainer, create Label, ...) ]
 layout.addWidget(label, BorderLayoutManager.CENTER, ...);

-an RuntimeException will be thrown:
+a RuntimeException will be thrown:

 Exception in thread "main" java.lang.RuntimeException: unknown constraint: jcurses.widgets.BorderLayoutConstraint
 at jcurses.widgets.DefaultLayoutManager.layout(DefaultLayoutManager.java:33)