#Jpanel flowlayout example code

b itself contains a panel, c, and a button. I have an organizing panel (with gridbaglayout) and within it 2 panels, a and b. You mentioned above that placing the panel (having the wraplayout) within a scrollpane will not change the size of it but scroll bars will appear as needed. Thanks for writing wraplayout !! Just what I needed. Note, you must use the setSize() method, this will still allow the preferred size to be dynamically changed. You can limit the width of the container by using: So if you pack() a frame the preferred width may be excessive. The initial preferred size calculation of the layout manager still assumes all components will be displayed on a single row. When the panel is added to a scroll pane, the size of the scroll pane won’t change, but horizontal and vertical scrollbars will appear as required. You use the WrapLayout the same as you would use the FlowLayout:Īs the frame is resized smaller, the button panel will increase in height and the blue panel will decrease: In the following example, the button panel was added to the north of a BorderLayout and the blue panel added to the center. This will result in synchronizing the preferred size of the container with the layout of the container.

The WrapLayout extends the FlowLayout to implement this functionality. In other words, as the width of the container changes the height will need to be recalculated as well. What we want is the preferred size to be dynamically calculated as the size of the container is changed. When the components are wrapped to a new row, the preferred size doesn’t change so you never see the components on the extra row. However, the problem is that the functions don’t talk to one another.

#Jpanel flowlayout example code

The layout code will wrap components to the next row when the maximum width of the container is encountered.

The preferred size of the container assumes all components will be laid out in a single row. layout the components in the container based on the layout rules.determine the preferred size of the container.