コード例 #1
0
    private void beginDrag(Event evt) {
      String docId = initDragParams_.getDocId();
      int dragTabWidth = initDragWidth_;

      // set drag element state
      dragTabsHost_ = getTabBarElement();
      dragScrollHost_ = dragTabsHost_.getParentElement();
      outOfBounds_ = 0;
      candidatePos_ = null;
      startPos_ = null;

      // attempt to determine which tab the cursor is over
      Point hostPos = DomUtils.getRelativePosition(Document.get().getBody(), dragTabsHost_);
      int dragX = evt.getClientX() - hostPos.getX();
      for (int i = 0; i < dragTabsHost_.getChildCount(); i++) {
        Node node = dragTabsHost_.getChild(i);
        if (node.getNodeType() == Node.ELEMENT_NODE) {
          int left =
              DomUtils.leftRelativeTo(dragTabsHost_, Element.as(node))
                  - dragScrollHost_.getScrollLeft();
          int right = left + Element.as(node).getOffsetWidth();
          if (left <= dragX && dragX <= right) {
            candidatePos_ = i;
            break;
          }
        }
      }

      // let the rest of the IDE know we're dragging (this will enable us to
      // disable drag targets that might otherwise be happy to accept the
      // data)
      curState_ = STATE_DRAGGING;
      events_.fireEvent(
          new DocTabDragStateChangedEvent(DocTabDragStateChangedEvent.STATE_DRAGGING));

      // the relative position of the last node determines how far we
      // can drag
      dragMax_ =
          DomUtils.leftRelativeTo(dragTabsHost_, getLastChildElement(dragTabsHost_))
              + getLastChildElement(dragTabsHost_).getClientWidth();
      lastCursorX_ = evt.getClientX();

      // account for cursor starting out of bounds (e.g. dragging into
      // empty space on the right of the panel)
      if (lastCursorX_ > dragMax_ + (initDragParams_.getCursorOffset()))
        outOfBounds_ = (lastCursorX_ - dragMax_) - initDragParams_.getCursorOffset();

      // attempt to ascertain whether the element being dragged is one of
      // our own documents
      for (DocTab tab : docTabs_) {
        if (tab.getDocId() == docId) {
          dragElement_ = tab.getElement().getParentElement().getParentElement();
          break;
        }
      }

      // if we couldn't find the horizontal drag position in any tab, append
      // to the end
      if (candidatePos_ == null) {
        candidatePos_ = dragTabsHost_.getChildCount();
      }

      destPos_ = candidatePos_;

      // if we're dragging one of our own documents, figure out its physical
      // position
      if (dragElement_ != null) {
        for (int i = 0; i < dragTabsHost_.getChildCount(); i++) {
          if (dragTabsHost_.getChild(i) == dragElement_) {
            startPos_ = i;
            break;
          }
        }
      }

      // compute the start location for the drag
      if (candidatePos_ >= dragTabsHost_.getChildCount()) {
        Element lastTab = getLastChildElement(dragTabsHost_);
        lastElementX_ = DomUtils.leftRelativeTo(dragTabsHost_, lastTab) + lastTab.getOffsetWidth();
      } else {
        lastElementX_ =
            DomUtils.leftRelativeTo(
                dragTabsHost_, Element.as(dragTabsHost_.getChild(candidatePos_)));
      }

      // if we're dragging one of our own tabs, snap it out of the
      // tabset
      if (dragElement_ != null) {
        dragElement_.getStyle().setPosition(Position.ABSOLUTE);
        dragElement_.getStyle().setLeft(lastElementX_, Unit.PX);
        dragElement_.getStyle().setZIndex(100);
        Scheduler.get()
            .scheduleDeferred(
                new ScheduledCommand() {
                  @Override
                  public void execute() {
                    dragElement_.getStyle().setDisplay(Display.NONE);
                  }
                });
      }

      // create the placeholder that shows where this tab will go when the
      // mouse is released
      dragPlaceholder_ = Document.get().createDivElement();
      dragPlaceholder_.getStyle().setWidth(dragTabWidth - 4, Unit.PX);
      dragPlaceholder_.getStyle().setHeight(dragTabsHost_.getClientHeight() - 3, Unit.PX);
      dragPlaceholder_.getStyle().setDisplay(Display.INLINE_BLOCK);
      dragPlaceholder_.getStyle().setPosition(Position.RELATIVE);
      dragPlaceholder_.getStyle().setFloat(Float.LEFT);
      dragPlaceholder_.getStyle().setBorderStyle(BorderStyle.DOTTED);
      dragPlaceholder_.getStyle().setBorderColor("#A1A2A3");
      dragPlaceholder_.getStyle().setBorderWidth(1, Unit.PX);
      dragPlaceholder_.getStyle().setMarginLeft(1, Unit.PX);
      dragPlaceholder_.getStyle().setMarginRight(1, Unit.PX);
      dragPlaceholder_.getStyle().setProperty("borderTopLeftRadius", "4px");
      dragPlaceholder_.getStyle().setProperty("borderTopRightRadius", "4px");
      dragPlaceholder_.getStyle().setProperty("borderBottom", "0px");
      if (candidatePos_ < dragTabsHost_.getChildCount()) {
        dragTabsHost_.insertBefore(dragPlaceholder_, dragTabsHost_.getChild(candidatePos_));
      } else {
        dragTabsHost_.appendChild(dragPlaceholder_);
      }
    }
コード例 #2
0
  public void ensureSelectedTabIsVisible(boolean animate) {
    if (currentAnimation_ != null) {
      currentAnimation_.cancel();
      currentAnimation_ = null;
    }

    Element selectedTab =
        (Element)
            DomUtils.findNode(
                getElement(),
                true,
                false,
                new NodePredicate() {
                  public boolean test(Node n) {
                    if (n.getNodeType() != Node.ELEMENT_NODE) return false;
                    return ((Element) n).getClassName().contains("gwt-TabLayoutPanelTab-selected");
                  }
                });
    if (selectedTab == null) {
      return;
    }
    selectedTab = selectedTab.getFirstChildElement().getFirstChildElement();

    Element tabBar = getTabBarElement();

    if (!isVisible() || !isAttached() || tabBar.getOffsetWidth() == 0) return; // not yet loaded

    final Element tabBarParent = tabBar.getParentElement();

    final int start = tabBarParent.getScrollLeft();
    int end =
        DomUtils.ensureVisibleHoriz(
            tabBarParent, selectedTab, padding_, padding_ + rightMargin_, true);

    // When tabs are closed, the overall width shrinks, and this can lead
    // to cases where there's too much empty space on the screen
    Node lastTab = getLastChildElement(tabBar);
    if (lastTab == null || lastTab.getNodeType() != Node.ELEMENT_NODE) return;
    int edge =
        DomUtils.getRelativePosition(tabBarParent, Element.as(lastTab)).x
            + Element.as(lastTab).getOffsetWidth();
    end = Math.min(end, Math.max(0, edge - (tabBarParent.getOffsetWidth() - rightMargin_)));

    if (edge <= tabBarParent.getOffsetWidth() - rightMargin_) end = 0;

    if (start != end) {
      if (!animate) {
        tabBarParent.setScrollLeft(end);
      } else {
        final int finalEnd = end;
        currentAnimation_ =
            new Animation() {
              @Override
              protected void onUpdate(double progress) {
                double delta = (finalEnd - start) * progress;
                tabBarParent.setScrollLeft((int) (start + delta));
              }

              @Override
              protected void onComplete() {
                if (this == currentAnimation_) {
                  tabBarParent.setScrollLeft(finalEnd);
                  currentAnimation_ = null;
                }
              }
            };
        currentAnimation_.run(Math.max(200, Math.min(1500, Math.abs(end - start) * 2)));
      }
    }
  }