Moved source into separate src directory due to popular request

[GpsPrune.git] / src / tim / prune / gui / GuiGridLayout.java

diff --git a/src/tim/prune/gui/GuiGridLayout.java b/src/tim/prune/gui/GuiGridLayout.java
new file mode 100644 (file)
index 0000000..703f7dd
--- /dev/null
+++ b/src/tim/prune/gui/GuiGridLayout.java
@@ -0,0 +1,93 @@
+package tim.prune.gui;
+
+import java.awt.GridBagConstraints;
+import java.awt.GridBagLayout;
+import java.awt.Insets;
+
+import javax.swing.JComponent;
+import javax.swing.JPanel;
+
+/**
+ * Class to make it easier to use GridBagLayout for a non-equal-width layout
+ * Default is two columns but can handle more
+ */
+public class GuiGridLayout
+{
+       private GridBagLayout _layout = null;
+       private GridBagConstraints _constraints = null;
+       private JPanel _panel = null;
+       private int _numColumns = 0;
+       private double[] _colWeights = null;
+       private boolean[] _rightAligns = null;
+       private int _x = 0;
+       private int _y = 0;
+
+       /**
+        * Constructor
+        * @param inPanel panel using layout
+        */
+       public GuiGridLayout(JPanel inPanel)
+       {
+               // Default is two columns, with more weight to the right-hand one; first column is right-aligned
+               this(inPanel, null, null);
+       }
+
+       /**
+        * Constructor
+        * @param inPanel panel using layout
+        * @param inColumnWeights array of column weights
+        * @param inAlignRights array of booleans, true for right alignment, false for left
+        */
+       public GuiGridLayout(JPanel inPanel, double[] inColumnWeights, boolean[] inAlignRights)
+       {
+               _panel = inPanel;
+               _layout = new GridBagLayout();
+               _constraints = new GridBagConstraints();
+               _colWeights = inColumnWeights;
+               _rightAligns = inAlignRights;
+               if (_colWeights == null || _rightAligns == null || _colWeights.length != _rightAligns.length
+                       || _colWeights.length < 2)
+               {
+                       _colWeights = new double[] {0.5, 1.0};
+                       _rightAligns = new boolean[] {true, false};
+               }
+               _numColumns = _colWeights.length;
+               _constraints.weightx = 1.0;
+               _constraints.weighty = 0.0;
+               _constraints.ipadx = 10;
+               _constraints.ipady = 1;
+               _constraints.insets = new Insets(1, 5, 1, 5);
+               // Apply layout to panel
+               _panel.setLayout(_layout);
+       }
+
+       /**
+        * Add the given component to the grid
+        * @param inComponent component to add
+        */
+       public void add(JComponent inComponent)
+       {
+               _constraints.gridx = _x;
+               _constraints.gridy = _y;
+               _constraints.weightx = _colWeights[_x];
+               // set anchor
+               _constraints.anchor = (_rightAligns[_x]?GridBagConstraints.LINE_END:GridBagConstraints.LINE_START);
+               _layout.setConstraints(inComponent, _constraints);
+               // add to panel
+               _panel.add(inComponent);
+               // work out next position
+               _x++;
+               if (_x >= _numColumns) {
+                       nextRow();
+               }
+       }
+
+       /**
+        * Go to the next row of the grid
+        */
+       public void nextRow()
+       {
+               _x = 0;
+               _y++;
+       }
+}