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- /*
- @ITMillApache2LicenseForJavaFiles@
- */
- package com.vaadin.ui;
-
- import java.util.HashMap;
- import java.util.Iterator;
- import java.util.LinkedList;
- import java.util.Map;
-
- import com.vaadin.event.LayoutEvents.LayoutClickEvent;
- import com.vaadin.event.LayoutEvents.LayoutClickListener;
- import com.vaadin.terminal.PaintException;
- import com.vaadin.terminal.PaintTarget;
- import com.vaadin.terminal.Paintable;
- import com.vaadin.terminal.gwt.client.MouseEventDetails;
- import com.vaadin.terminal.gwt.client.ui.VCssLayout;
-
- /**
- * CssLayout is a layout component that can be used in browser environment only.
- * It simply renders components and their captions into a same div element.
- * Component layout can then be adjusted with css.
- * <p>
- * In comparison to {@link HorizontalLayout} and {@link VerticalLayout}
- * <ul>
- * <li>rather similar server side api
- * <li>no spacing, alignment or expand ratios
- * <li>much simpler DOM that can be styled by skilled web developer
- * <li>no abstraction of browser differences (developer must ensure that the
- * result works properly on each browser)
- * <li>different kind of handling for relative sizes (that are set from server
- * side) (*)
- * <li>noticeably faster rendering time in some situations as we rely more on
- * the browser's rendering engine.
- * </ul>
- * <p>
- * With {@link CustomLayout} one can often achieve similar results (good looking
- * layouts with web technologies), but with CustomLayout developer needs to work
- * with fixed templates.
- * <p>
- * By extending CssLayout one can also inject some css rules straight to child
- * components using {@link #getCss(Component)}.
- *
- * <p>
- * (*) Relative sizes (set from server side) are treated bit differently than in
- * other layouts in Vaadin. In cssLayout the size is calculated relatively to
- * CSS layouts content area which is pretty much as in html and css. In other
- * layouts the size of component is calculated relatively to the "slot" given by
- * layout.
- * <p>
- * Also note that client side framework in Vaadin modifies inline style
- * properties width and height. This happens on each update to component. If one
- * wants to set component sizes with CSS, component must have undefined size on
- * server side (which is not the default for all components) and the size must
- * be defined with class styles - not by directly injecting width and height.
- *
- * @since 6.1 brought in from "FastLayouts" incubator project
- *
- */
- @ClientWidget(VCssLayout.class)
- public class CssLayout extends AbstractLayout {
-
- private static final String CLICK_EVENT = VCssLayout.CLICK_EVENT_IDENTIFIER;
-
- /**
- * Custom layout slots containing the components.
- */
- protected LinkedList<Component> components = new LinkedList<Component>();
-
- /**
- * Add a component into this container. The component is added to the right
- * or under the previous component.
- *
- * @param c
- * the component to be added.
- */
- @Override
- public void addComponent(Component c) {
- super.addComponent(c);
- components.add(c);
- requestRepaint();
- }
-
- /**
- * Adds a component into this container. The component is added to the left
- * or on top of the other components.
- *
- * @param c
- * the component to be added.
- */
- public void addComponentAsFirst(Component c) {
- super.addComponent(c);
- components.addFirst(c);
- requestRepaint();
- }
-
- /**
- * Adds a component into indexed position in this container.
- *
- * @param c
- * the component to be added.
- * @param index
- * the Index of the component position. The components currently
- * in and after the position are shifted forwards.
- */
- public void addComponent(Component c, int index) {
- super.addComponent(c);
- components.add(index, c);
- requestRepaint();
- }
-
- /**
- * Removes the component from this container.
- *
- * @param c
- * the component to be removed.
- */
- @Override
- public void removeComponent(Component c) {
- super.removeComponent(c);
- components.remove(c);
- requestRepaint();
- }
-
- /**
- * Gets the component container iterator for going trough all the components
- * in the container.
- *
- * @return the Iterator of the components inside the container.
- */
- public Iterator<Component> getComponentIterator() {
- return components.iterator();
- }
-
- /**
- * Paints the content of this component.
- *
- * @param target
- * the Paint Event.
- * @throws PaintException
- * if the paint operation failed.
- */
- @Override
- public void paintContent(PaintTarget target) throws PaintException {
- super.paintContent(target);
- HashMap<Paintable, String> componentCss = null;
- // Adds all items in all the locations
- for (Component c : components) {
- // Paint child component UIDL
- c.paint(target);
- String componentCssString = getCss(c);
- if (componentCssString != null) {
- if (componentCss == null) {
- componentCss = new HashMap<Paintable, String>();
- }
- componentCss.put(c, componentCssString);
- }
- }
- if (componentCss != null) {
- target.addAttribute("css", componentCss);
- }
- }
-
- /**
- * Returns styles to be applied to given component. Override this method to
- * inject custom style rules to components.
- *
- * <p>
- * Note that styles are injected over previous styles before actual child
- * rendering. Previous styles are not cleared, but overridden.
- *
- * <p>
- * Note that one most often achieves better code style, by separating
- * styling to theme (with custom theme and {@link #addStyleName(String)}.
- * With own custom styles it is also very easy to break browser
- * compatibility.
- *
- * @param c
- * the component
- * @return css rules to be applied to component
- */
- protected String getCss(Component c) {
- return null;
- }
-
- /* Documented in superclass */
- public void replaceComponent(Component oldComponent, Component newComponent) {
-
- // Gets the locations
- int oldLocation = -1;
- int newLocation = -1;
- int location = 0;
- for (final Iterator i = components.iterator(); i.hasNext();) {
- final Component component = (Component) i.next();
-
- if (component == oldComponent) {
- oldLocation = location;
- }
- if (component == newComponent) {
- newLocation = location;
- }
-
- location++;
- }
-
- if (oldLocation == -1) {
- addComponent(newComponent);
- } else if (newLocation == -1) {
- removeComponent(oldComponent);
- addComponent(newComponent, oldLocation);
- } else {
- if (oldLocation > newLocation) {
- components.remove(oldComponent);
- components.add(newLocation, oldComponent);
- components.remove(newComponent);
- components.add(oldLocation, newComponent);
- } else {
- components.remove(newComponent);
- components.add(oldLocation, newComponent);
- components.remove(oldComponent);
- components.add(newLocation, oldComponent);
- }
-
- requestRepaint();
- }
- }
-
- @Override
- public void changeVariables(Object source, Map variables) {
- super.changeVariables(source, variables);
-
- if (variables.containsKey(CLICK_EVENT)) {
- fireClick((Map<String, Object>) variables.get(CLICK_EVENT));
- }
-
- }
-
- private void fireClick(Map<String, Object> parameters) {
- MouseEventDetails mouseDetails = MouseEventDetails
- .deSerialize((String) parameters.get("mouseDetails"));
- Component childComponent = (Component) parameters.get("component");
-
- fireEvent(new LayoutClickEvent(this, mouseDetails, childComponent));
- }
-
- /**
- * Add a click listener to the layout. The listener is called whenever the
- * user clicks inside the layout. Also when the click targets a component
- * inside the Panel, provided the targeted component does not prevent the
- * click event from propagating. A caption is not considered part of a
- * component.
- *
- * The child component that was clicked is included in the
- * {@link LayoutClickEvent}.
- *
- * Use {@link #removeListener(LayoutClickListener)} to remove the listener.
- *
- * @param listener
- * The listener to add
- */
- public void addListener(LayoutClickListener listener) {
- addListener(CLICK_EVENT, LayoutClickEvent.class, listener,
- LayoutClickListener.clickMethod);
- }
-
- /**
- * Remove a click listener from the layout. The listener should earlier have
- * been added using {@link #addListener(LayoutClickListener)}.
- *
- * @param listener
- * The listener to remove
- */
- public void removeListener(LayoutClickListener listener) {
- removeListener(CLICK_EVENT, LayoutClickEvent.class, listener);
- }
-
- }
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