JDK8/Java8源码在线阅读
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
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* published by the Free Software Foundation. Oracle designates this
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* by Oracle in the LICENSE file that accompanied this code.
*
* This code is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
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package javax.swing.plaf.synth;
import javax.swing.*;
import java.awt.*;
import java.beans.*;
import javax.swing.plaf.*;
import javax.swing.plaf.basic.BasicButtonUI;
import javax.swing.plaf.basic.BasicHTML;
import javax.swing.text.View;
/**
* Provides the Synth L&F UI delegate for
* {@link javax.swing.JButton}.
*
* @author Scott Violet
* @since 1.7
*/
public class SynthButtonUI extends BasicButtonUI implements
PropertyChangeListener, SynthUI {
private SynthStyle style;
/**
* Creates a new UI object for the given component.
*
* @param c component to create UI object for
* @return the UI object
*/
public static ComponentUI createUI(JComponent c) {
return new SynthButtonUI();
}
/**
* {@inheritDoc}
*/
@Override
protected void installDefaults(AbstractButton b) {
updateStyle(b);
LookAndFeel.installProperty(b, "rolloverEnabled", Boolean.TRUE);
}
/**
* {@inheritDoc}
*/
@Override
protected void installListeners(AbstractButton b) {
super.installListeners(b);
b.addPropertyChangeListener(this);
}
void updateStyle(AbstractButton b) {
SynthContext context = getContext(b, SynthConstants.ENABLED);
SynthStyle oldStyle = style;
style = SynthLookAndFeel.updateStyle(context, this);
if (style != oldStyle) {
if (b.getMargin() == null ||
(b.getMargin() instanceof UIResource)) {
Insets margin = (Insets)style.get(context,getPropertyPrefix() +
"margin");
if (margin == null) {
// Some places assume margins are non-null.
margin = SynthLookAndFeel.EMPTY_UIRESOURCE_INSETS;
}
b.setMargin(margin);
}
Object value = style.get(context, getPropertyPrefix() + "iconTextGap");
if (value != null) {
LookAndFeel.installProperty(b, "iconTextGap", value);
}
value = style.get(context, getPropertyPrefix() + "contentAreaFilled");
LookAndFeel.installProperty(b, "contentAreaFilled",
value != null? value : Boolean.TRUE);
if (oldStyle != null) {
uninstallKeyboardActions(b);
installKeyboardActions(b);
}
}
context.dispose();
}
/**
* {@inheritDoc}
*/
@Override
protected void uninstallListeners(AbstractButton b) {
super.uninstallListeners(b);
b.removePropertyChangeListener(this);
}
/**
* {@inheritDoc}
*/
@Override
protected void uninstallDefaults(AbstractButton b) {
SynthContext context = getContext(b, ENABLED);
style.uninstallDefaults(context);
context.dispose();
style = null;
}
/**
* {@inheritDoc}
*/
@Override
public SynthContext getContext(JComponent c) {
return getContext(c, getComponentState(c));
}
SynthContext getContext(JComponent c, int state) {
return SynthContext.getContext(c, style, state);
}
/**
* Returns the current state of the passed in <code>AbstractButton</code>.
*/
private int getComponentState(JComponent c) {
int state = ENABLED;
if (!c.isEnabled()) {
state = DISABLED;
}
if (SynthLookAndFeel.getSelectedUI() == this) {
return SynthLookAndFeel.getSelectedUIState() | SynthConstants.ENABLED;
}
AbstractButton button = (AbstractButton) c;
ButtonModel model = button.getModel();
if (model.isPressed()) {
if (model.isArmed()) {
state = PRESSED;
}
else {
state = MOUSE_OVER;
}
}
if (model.isRollover()) {
state |= MOUSE_OVER;
}
if (model.isSelected()) {
state |= SELECTED;
}
if (c.isFocusOwner() && button.isFocusPainted()) {
state |= FOCUSED;
}
if ((c instanceof JButton) && ((JButton)c).isDefaultButton()) {
state |= DEFAULT;
}
return state;
}
/**
* {@inheritDoc}
*/
@Override
public int getBaseline(JComponent c, int width, int height) {
if (c == null) {
throw new NullPointerException("Component must be non-null");
}
if (width < 0 || height < 0) {
throw new IllegalArgumentException(
"Width and height must be >= 0");
}
AbstractButton b = (AbstractButton)c;
String text = b.getText();
if (text == null || "".equals(text)) {
return -1;
}
Insets i = b.getInsets();
Rectangle viewRect = new Rectangle();
Rectangle textRect = new Rectangle();
Rectangle iconRect = new Rectangle();
viewRect.x = i.left;
viewRect.y = i.top;
viewRect.width = width - (i.right + viewRect.x);
viewRect.height = height - (i.bottom + viewRect.y);
// layout the text and icon
SynthContext context = getContext(b);
FontMetrics fm = context.getComponent().getFontMetrics(
context.getStyle().getFont(context));
context.getStyle().getGraphicsUtils(context).layoutText(
context, fm, b.getText(), b.getIcon(),
b.getHorizontalAlignment(), b.getVerticalAlignment(),
b.getHorizontalTextPosition(), b.getVerticalTextPosition(),
viewRect, iconRect, textRect, b.getIconTextGap());
View view = (View)b.getClientProperty(BasicHTML.propertyKey);
int baseline;
if (view != null) {
baseline = BasicHTML.getHTMLBaseline(view, textRect.width,
textRect.height);
if (baseline >= 0) {
baseline += textRect.y;
}
}
else {
baseline = textRect.y + fm.getAscent();
}
context.dispose();
return baseline;
}
// ********************************
// Paint Methods
// ********************************
/**
* Notifies this UI delegate to repaint the specified component.
* This method paints the component background, then calls
* the {@link #paint(SynthContext,Graphics)} method.
*
* <p>In general, this method does not need to be overridden by subclasses.
* All Look and Feel rendering code should reside in the {@code paint} method.
*
* @param g the {@code Graphics} object used for painting
* @param c the component being painted
* @see #paint(SynthContext,Graphics)
*/
@Override
public void update(Graphics g, JComponent c) {
SynthContext context = getContext(c);
SynthLookAndFeel.update(context, g);
paintBackground(context, g, c);
paint(context, g);
context.dispose();
}
/**
* Paints the specified component according to the Look and Feel.
* <p>This method is not used by Synth Look and Feel.
* Painting is handled by the {@link #paint(SynthContext,Graphics)} method.
*
* @param g the {@code Graphics} object used for painting
* @param c the component being painted
* @see #paint(SynthContext,Graphics)
*/
@Override
public void paint(Graphics g, JComponent c) {
SynthContext context = getContext(c);
paint(context, g);
context.dispose();
}
/**
* Paints the specified component.
*
* @param context context for the component being painted
* @param g the {@code Graphics} object used for painting
* @see #update(Graphics,JComponent)
*/
protected void paint(SynthContext context, Graphics g) {
AbstractButton b = (AbstractButton)context.getComponent();
g.setColor(context.getStyle().getColor(context,
ColorType.TEXT_FOREGROUND));
g.setFont(style.getFont(context));
context.getStyle().getGraphicsUtils(context).paintText(
context, g, b.getText(), getIcon(b),
b.getHorizontalAlignment(), b.getVerticalAlignment(),
b.getHorizontalTextPosition(), b.getVerticalTextPosition(),
b.getIconTextGap(), b.getDisplayedMnemonicIndex(),
getTextShiftOffset(context));
}
void paintBackground(SynthContext context, Graphics g, JComponent c) {
if (((AbstractButton) c).isContentAreaFilled()) {
context.getPainter().paintButtonBackground(context, g, 0, 0,
c.getWidth(),
c.getHeight());
}
}
/**
* {@inheritDoc}
*/
@Override
public void paintBorder(SynthContext context, Graphics g, int x,
int y, int w, int h) {
context.getPainter().paintButtonBorder(context, g, x, y, w, h);
}
/**
* Returns the default icon. This should not callback
* to the JComponent.
*
* @param b button the icon is associated with
* @return default icon
*/
protected Icon getDefaultIcon(AbstractButton b) {
SynthContext context = getContext(b);
Icon icon = context.getStyle().getIcon(context, getPropertyPrefix() + "icon");
context.dispose();
return icon;
}
/**
* Returns the Icon to use for painting the button. The icon is chosen with
* respect to the current state of the button.
*
* @param b button the icon is associated with
* @return an icon
*/
protected Icon getIcon(AbstractButton b) {
Icon icon = b.getIcon();
ButtonModel model = b.getModel();
if (!model.isEnabled()) {
icon = getSynthDisabledIcon(b, icon);
} else if (model.isPressed() && model.isArmed()) {
icon = getPressedIcon(b, getSelectedIcon(b, icon));
} else if (b.isRolloverEnabled() && model.isRollover()) {
icon = getRolloverIcon(b, getSelectedIcon(b, icon));
} else if (model.isSelected()) {
icon = getSelectedIcon(b, icon);
} else {
icon = getEnabledIcon(b, icon);
}
if(icon == null) {
return getDefaultIcon(b);
}
return icon;
}
/**
* This method will return the icon that should be used for a button. We
* only want to use the synth icon defined by the style if the specific
* icon has not been defined for the button state and the backup icon is a
* UIResource (we set it, not the developer).
*
* @param b button
* @param specificIcon icon returned from the button for the specific state
* @param defaultIcon fallback icon
* @param state the synth state of the button
*/
private Icon getIcon(AbstractButton b, Icon specificIcon, Icon defaultIcon,
int state) {
Icon icon = specificIcon;
if (icon == null) {
if (defaultIcon instanceof UIResource) {
icon = getSynthIcon(b, state);
if (icon == null) {
icon = defaultIcon;
}
} else {
icon = defaultIcon;
}
}
return icon;
}
private Icon getSynthIcon(AbstractButton b, int synthConstant) {
return style.getIcon(getContext(b, synthConstant), getPropertyPrefix() + "icon");
}
private Icon getEnabledIcon(AbstractButton b, Icon defaultIcon) {
if (defaultIcon == null) {
defaultIcon = getSynthIcon(b, SynthConstants.ENABLED);
}
return defaultIcon;
}
private Icon getSelectedIcon(AbstractButton b, Icon defaultIcon) {
return getIcon(b, b.getSelectedIcon(), defaultIcon,
SynthConstants.SELECTED);
}
private Icon getRolloverIcon(AbstractButton b, Icon defaultIcon) {
ButtonModel model = b.getModel();
Icon icon;
if (model.isSelected()) {
icon = getIcon(b, b.getRolloverSelectedIcon(), defaultIcon,
SynthConstants.MOUSE_OVER | SynthConstants.SELECTED);
} else {
icon = getIcon(b, b.getRolloverIcon(), defaultIcon,
SynthConstants.MOUSE_OVER);
}
return icon;
}
private Icon getPressedIcon(AbstractButton b, Icon defaultIcon) {
return getIcon(b, b.getPressedIcon(), defaultIcon,
SynthConstants.PRESSED);
}
private Icon getSynthDisabledIcon(AbstractButton b, Icon defaultIcon) {
ButtonModel model = b.getModel();
Icon icon;
if (model.isSelected()) {
icon = getIcon(b, b.getDisabledSelectedIcon(), defaultIcon,
SynthConstants.DISABLED | SynthConstants.SELECTED);
} else {
icon = getIcon(b, b.getDisabledIcon(), defaultIcon,
SynthConstants.DISABLED);
}
return icon;
}
/**
* Returns the amount to shift the text/icon when painting.
*/
private int getTextShiftOffset(SynthContext state) {
AbstractButton button = (AbstractButton)state.getComponent();
ButtonModel model = button.getModel();
if (model.isArmed() && model.isPressed() &&
button.getPressedIcon() == null) {
return state.getStyle().getInt(state, getPropertyPrefix() +
"textShiftOffset", 0);
}
return 0;
}
// ********************************
// Layout Methods
// ********************************
/**
* {@inheritDoc}
*/
@Override
public Dimension getMinimumSize(JComponent c) {
if (c.getComponentCount() > 0 && c.getLayout() != null) {
return null;
}
AbstractButton b = (AbstractButton)c;
SynthContext ss = getContext(c);
Dimension size = ss.getStyle().getGraphicsUtils(ss).getMinimumSize(
ss, ss.getStyle().getFont(ss), b.getText(), getSizingIcon(b),
b.getHorizontalAlignment(), b.getVerticalAlignment(),
b.getHorizontalTextPosition(),
b.getVerticalTextPosition(), b.getIconTextGap(),
b.getDisplayedMnemonicIndex());
ss.dispose();
return size;
}
/**
* {@inheritDoc}
*/
@Override
public Dimension getPreferredSize(JComponent c) {
if (c.getComponentCount() > 0 && c.getLayout() != null) {
return null;
}
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