- 追加された行はこの色です。
- 削除された行はこの色です。
TITLE:JListのアイテムを範囲指定で選択
#navi(../)
*JListのアイテムを範囲指定で選択 [#va695101]
>編集者:[[Terai Atsuhiro>terai]]~
作成日:2006-08-14~
更新日:&lastmod;
#contents
**概要 [#x17f8eee]
JListのアイテムをラバーバンドで範囲指定して選択します。
#screenshot
**サンプルコード [#t7aa984b]
#code{{
class MyList extends JList {
private final Color rcolor;
private final Color pcolor;
private final AlphaComposite alcomp
private final Polygon polygon = new Polygon();
private final Line2D line = new Line2D.Double();
private Point srcPoint = null;
public MyList(ListModel model) {
super(model);
rcolor = SystemColor.activeCaption;
pcolor = makeColor(rcolor);
alcomp = AlphaComposite.getInstance(AlphaComposite.SRC_OVER, 0.1f);
setLayoutOrientation(JList.HORIZONTAL_WRAP);
setVisibleRowCount(0);
setFixedCellWidth(62);
setFixedCellHeight(62);
setBorder(BorderFactory.createEmptyBorder(5,5,5,5));
setCellRenderer(new ListCellRenderer() {
public Component getListCellRendererComponent(
JList list, Object value, int index, boolean isSelected,
boolean cellHasFocus) {
MyIcon icon = (MyIcon)getModel().getElementAt(index);
icon.setSelected(isSelected);
icon.setFocused(cellHasFocus);
return icon;
}
});
addMouseMotionListener(new MouseMotionAdapter() {
public void mouseDragged(MouseEvent e){
if(srcPoint==null) srcPoint = e.getPoint();
Point destPoint = e.getPoint();
polygon.reset();
polygon.addPoint(srcPoint.x, srcPoint.y);
polygon.addPoint(destPoint.x, srcPoint.y);
polygon.addPoint(destPoint.x, destPoint.y);
polygon.addPoint(srcPoint.x, destPoint.y);
if(srcPoint.getX()==destPoint.getX() ||
srcPoint.getY()==destPoint.getY()) {
line.setLine(srcPoint.getX(),srcPoint.getY(),
destPoint.getX(),destPoint.getY());
setSelectedIndices(getIntersectsIcons(line));
}else{
setSelectedIndices(getIntersectsIcons(polygon));
}
repaint();
}
});
addMouseListener(new MouseAdapter() {
public void mouseReleased(MouseEvent e) {
srcPoint = null;
repaint();
}
public void mousePressed(MouseEvent e) {
if(locationToIndex(e.getPoint())<0) {
clearSelection();
repaint();
}else{
int index = locationToIndex(e.getPoint());
MyIcon icon = (MyIcon)getModel().getElementAt(index);
Rectangle rect = getCellBounds(index,index);
if(!rect.contains(e.getPoint())) {
clearSelection();
repaint();
}
}
}
});
}
public void paintComponent(Graphics g) {
super.paintComponent(g);
if(srcPoint==null) return;
Graphics2D g2d = (Graphics2D) g;
g2d.setPaint(rcolor);
g2d.drawPolygon(polygon);
g2d.setComposite(alcomp);
g2d.setPaint(pcolor);
g2d.fillPolygon(polygon);
}
private int[] getIntersectsIcons(Shape p) {
ListModel model = getModel();
Vector list = new Vector(model.getSize());
for(int i=0;i<model.getSize();i++) {
Rectangle r = MyList.this.getCellBounds(i,i);
if(p.intersects(r)) {
list.add(new Integer(i));
}
}
int[] il = new int[list.size()];
for(int i=0;i<list.size();i++) {
il[i] = ((Integer)list.get(i)).intValue();
}
return il;
}
private Color makeColor(Color c) {
int r = c.getRed();
int g = c.getGreen();
int b = c.getBlue();
if(r>g) return (r>b)?new Color(r,0,0):new Color(0,0,b);
else return (g>b)?new Color(0,g,0):new Color(0,0,b);
}
}
class MyList extends JList {
private final Color rcolor;
private final Color pcolor;
private final AlphaComposite alcomp
private final Polygon polygon = new Polygon();
private final Line2D line = new Line2D.Double();
private Point srcPoint = null;
public MyList(ListModel model) {
super(model);
rcolor = SystemColor.activeCaption;
pcolor = makeColor(rcolor);
alcomp = AlphaComposite.getInstance(AlphaComposite.SRC_OVER, 0.1f);
setLayoutOrientation(JList.HORIZONTAL_WRAP);
setVisibleRowCount(0);
setFixedCellWidth(62);
setFixedCellHeight(62);
setBorder(BorderFactory.createEmptyBorder(5,5,5,5));
setCellRenderer(new ListCellRenderer() {
public Component getListCellRendererComponent(
JList list, Object value, int index, boolean isSelected,
boolean cellHasFocus) {
MyIcon icon = (MyIcon)getModel().getElementAt(index);
icon.setSelected(isSelected);
icon.setFocused(cellHasFocus);
return icon;
}
});
addMouseMotionListener(new MouseMotionAdapter() {
public void mouseDragged(MouseEvent e){
if(srcPoint==null) srcPoint = e.getPoint();
Point destPoint = e.getPoint();
polygon.reset();
polygon.addPoint(srcPoint.x, srcPoint.y);
polygon.addPoint(destPoint.x, srcPoint.y);
polygon.addPoint(destPoint.x, destPoint.y);
polygon.addPoint(srcPoint.x, destPoint.y);
if(srcPoint.getX()==destPoint.getX() ||
srcPoint.getY()==destPoint.getY()) {
line.setLine(srcPoint.getX(),srcPoint.getY(),
destPoint.getX(),destPoint.getY());
setSelectedIndices(getIntersectsIcons(line));
}else{
setSelectedIndices(getIntersectsIcons(polygon));
}
repaint();
}
});
addMouseListener(new MouseAdapter() {
public void mouseReleased(MouseEvent e) {
srcPoint = null;
repaint();
}
public void mousePressed(MouseEvent e) {
if(locationToIndex(e.getPoint())<0) {
clearSelection();
repaint();
}else{
int index = locationToIndex(e.getPoint());
MyIcon icon = (MyIcon)getModel().getElementAt(index);
Rectangle rect = getCellBounds(index,index);
if(!rect.contains(e.getPoint())) {
clearSelection();
repaint();
}
}
}
});
}
public void paintComponent(Graphics g) {
super.paintComponent(g);
if(srcPoint==null) return;
Graphics2D g2d = (Graphics2D) g;
g2d.setPaint(rcolor);
g2d.drawPolygon(polygon);
g2d.setComposite(alcomp);
g2d.setPaint(pcolor);
g2d.fillPolygon(polygon);
}
private int[] getIntersectsIcons(Shape p) {
ListModel model = getModel();
Vector list = new Vector(model.getSize());
for(int i=0;i<model.getSize();i++) {
Rectangle r = MyList.this.getCellBounds(i,i);
if(p.intersects(r)) {
list.add(i);
}
}
int[] il = new int[list.size()];
for(int i=0;i<list.size();i++) {
il[i] = list.get(i);
}
return il;
}
private Color makeColor(Color c) {
int r = c.getRed();
int g = c.getGreen();
int b = c.getBlue();
if(r>g) return (r>b)?new Color(r,0,0):new Color(0,0,b);
else return (g>b)?new Color(0,g,0):new Color(0,0,b);
}
}
}}
-&jnlp;
-&jar;
-&zip;
**解説 [#e178a26c]
JListにマウスリスナーを設定して、ドラッグに応じて矩形を描画しています。このとき、その矩形の内部にアイテムアイコンが重なる場合は、それを選択状態に変更しています。選択範囲が矩形にならずに直線になっている場合は、別途その直線と交差するアイテムを選択するようにしています。
JList内のアイテムの配置は、JList#setLayoutOrientation(JList.HORIZONTAL_WRAP)メソッドを使っているため、水平方向に整列されます。
**参考リンク [#o8eb5cf2]
-[[Can someone optimise the following code ?>http://forum.java.sun.com/thread.jspa?threadID=757107]]
-[[XP Style Icons - Windows Application Icon, Software XP Icons>http://www.icongalore.com/]]
**コメント [#re81cc47]
#comment