/* Title: Pure/GUI/wrap_panel.scala
Author: Makarius
Panel with improved FlowLayout for wrapping of components over
multiple lines, see also
https://tips4java.wordpress.com/2008/11/06/wrap-layout/ and
scala.swing.FlowPanel.
*/
package isabelle
import java.awt.{FlowLayout, Container, Dimension}
import javax.swing.{JComponent, JPanel, JScrollPane}
import scala.swing.{Panel, FlowPanel, Component, SequentialContainer, ScrollPane}
object Wrap_Panel
{
val Alignment = FlowPanel.Alignment
class Layout(align: Int = FlowLayout.CENTER, hgap: Int = 5, vgap: Int = 5)
extends FlowLayout(align: Int, hgap: Int, vgap: Int)
{
override def preferredLayoutSize(target: Container): Dimension =
layout_size(target, true)
override def minimumLayoutSize(target: Container): Dimension =
{
val minimum = layout_size(target, false)
minimum.width -= (getHgap + 1)
minimum
}
private def layout_size(target: Container, preferred: Boolean): Dimension =
{
target.getTreeLock.synchronized
{
val target_width =
if (target.getSize.width == 0) Integer.MAX_VALUE
else target.getSize.width
val hgap = getHgap
val vgap = getVgap
val insets = target.getInsets
val horizontal_insets_and_gap = insets.left + insets.right + (hgap * 2)
val max_width = target_width - horizontal_insets_and_gap
/* fit components into rows */
val dim = new Dimension(0, 0)
var row_width = 0
var row_height = 0
def add_row()
{
dim.width = dim.width max row_width
if (dim.height > 0) dim.height += vgap
dim.height += row_height
}
for {
i <- (0 until target.getComponentCount).iterator
m = target.getComponent(i)
if m.isVisible
d = if (preferred) m.getPreferredSize else m.getMinimumSize()
}
{
if (row_width + d.width > max_width) {
add_row()
row_width = 0
row_height = 0
}
if (row_width != 0) row_width += hgap
row_width += d.width
row_height = row_height max d.height
}
add_row()
dim.width += horizontal_insets_and_gap
dim.height += insets.top + insets.bottom + vgap * 2
/* special treatment for ScrollPane */
val scroll_pane =
GUI.ancestors(target).exists(
{
case _: JScrollPane => true
case c: JComponent if Component.wrap(c).isInstanceOf[ScrollPane] => true
case _ => false
})
if (scroll_pane && target.isValid)
dim.width -= (hgap + 1)
dim
}
}
}
def apply(contents: List[Component] = Nil,
alignment: Alignment.Value = Alignment.Right): Wrap_Panel =
new Wrap_Panel(contents, alignment)
}
class Wrap_Panel(contents0: List[Component] = Nil,
alignment: Wrap_Panel.Alignment.Value = Wrap_Panel.Alignment.Right)
extends Panel with SequentialContainer.Wrapper
{
override lazy val peer: JPanel =
new JPanel(new Wrap_Panel.Layout(alignment.id)) with SuperMixin
contents ++= contents0
private def layoutManager = peer.getLayout.asInstanceOf[Wrap_Panel.Layout]
def vGap: Int = layoutManager.getVgap
def vGap_=(n: Int) { layoutManager.setVgap(n) }
def hGap: Int = layoutManager.getHgap
def hGap_=(n: Int) { layoutManager.setHgap(n) }
}
¤ Dauer der Verarbeitung: 0.23 Sekunden
(vorverarbeitet)
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