org.eclipse.swt.widgets.Tree.getTopItem()方法的使用及代码示例

x33g5p2x  于2022-01-29 转载在 其他  
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本文整理了Java中org.eclipse.swt.widgets.Tree.getTopItem()方法的一些代码示例，展示了Tree.getTopItem()的具体用法。这些代码示例主要来源于Github/Stackoverflow/Maven等平台，是从一些精选项目中提取出来的代码，具有较强的参考意义，能在一定程度帮忙到你。Tree.getTopItem()方法的具体详情如下：
包路径：org.eclipse.swt.widgets.Tree
类名称：Tree
方法名：getTopItem

Tree.getTopItem介绍

[英]Returns the item which is currently at the top of the receiver. This item can change when items are expanded, collapsed, scrolled or new items are added or removed.
[中]返回当前位于接收器顶部的项。当项目展开、折叠、滚动或添加或删除新项目时，此项目可能会更改。

代码示例

代码示例来源：origin: org.eclipse.pde/org.eclipse.pde.ui

private static int[] getTreeIndexPath(Tree tree) {
  int[] indexPath = null;
  if (tree != null) {
    TreeItem item = tree.getTopItem();
    int count = 1;
    while (item != null && (item = item.getParentItem()) != null) {
      count++;
    }
    indexPath = new int[count];
    int index = 0;
    item = tree.getTopItem();
    while (item != null && index < count) {
      TreeItem parent = item.getParentItem();
      if (parent != null) {
        indexPath[index++] = parent.indexOf(item);
      } else {
        indexPath[index++] = tree.indexOf(item);
      }
      item = parent;
    }
  }
  return indexPath;
}

代码示例来源：origin: org.eclipse.platform/org.eclipse.debug.ui

@Override
public TreePath getTopElementPath() {
  TreeItem topItem = ((Tree)getControl()).getTopItem();
  if (topItem != null && !topItem.isDisposed() && topItem.getData() != null) {
    return getTreePathFromItem(topItem);
  }
  return null;
}

代码示例来源：origin: org.eclipse.pde/org.eclipse.pde.ui

@Override
public void mouseScrolled(MouseEvent e) {
  // scroll only when MOD1 is pressed
  if ((e.stateMask & SWT.MOD1) == SWT.MOD1 && fTree != null) {
    TreeItem item = fTree.getTopItem();
    if (item != null) {
      TreeItem nextItem = item;
      for (int i = 0; i < fSkipLines; i++) {
        TreeItem foundItem = null;
        if (e.count < 0) // determines scrolling direction
          foundItem = NextItem(fTree, nextItem);
        else
          foundItem = PreviousItem(fTree, nextItem);
        if (foundItem == null) {
          break;
        }
        nextItem = foundItem;
      }
      fTree.setTopItem(nextItem);
    }
  }
}

代码示例来源：origin: org.eclipse.rap/org.eclipse.rap.rwt

Widget getItem(Tree tree, int x, int y) {
  Point point = new Point(x, y);
  point = tree.toControl(point);
  TreeItem item = tree.getItem(point);
  if (item == null) {
    Rectangle area = tree.getClientArea();
    if (area.contains(point)) {
      int treeBottom = area.y + area.height;
      item = tree.getTopItem();
      while (item != null) {
        Rectangle rect = item.getBounds();
        int itemBottom = rect.y + rect.height;
        if (rect.y <= point.y && point.y < itemBottom) return item;
        if (itemBottom > treeBottom) break;
        item = nextItem(tree, item);
      }
      return null;
    }
  }
  return item;
}

代码示例来源：origin: org.eclipse.swt.cocoa.macosx/x86_64

Widget getItem(Tree tree, int x, int y) {
  Point point = new Point(x, y);
  point = tree.toControl(point);
  TreeItem item = tree.getItem(point);
  if (item == null) {
    Rectangle area = tree.getClientArea();
    if (area.contains(point)) {
      int treeBottom = area.y + area.height;
      item = tree.getTopItem();
      while (item != null) {
        Rectangle rect = item.getBounds();
        int itemBottom = rect.y + rect.height;
        if (rect.y <= point.y && point.y < itemBottom) return item;
        if (itemBottom > treeBottom) break;
        item = nextItem(tree, item);
      }
      return null;
    }
  }
  return item;
}

代码示例来源：origin: org.eclipse.platform/org.eclipse.swt.gtk.linux.ppc

Widget getItem(Tree tree, int x, int y) {
  Point point = new Point(x, y);
  point = tree.toControl(point);
  TreeItem item = tree.getItem(point);
  if (item == null) {
    Rectangle area = tree.getClientArea();
    if (area.contains(point)) {
      int treeBottom = area.y + area.height;
      item = tree.getTopItem();
      while (item != null) {
        Rectangle rect = item.getBounds();
        int itemBottom = rect.y + rect.height;
        if (rect.y <= point.y && point.y < itemBottom) return item;
        if (itemBottom > treeBottom) break;
        item = nextItem(tree, item);
      }
      return null;
    }
  }
  return item;
}

代码示例来源：origin: org.eclipse.scout.sdk.deps/org.eclipse.swt.win32.win32.x86

Widget getItem(Tree tree, int x, int y) {
  Point point = new Point(x, y);
  point = tree.toControl(point);
  TreeItem item = tree.getItem(point);
  if (item == null) {
    Rectangle area = tree.getClientArea();
    if (area.contains(point)) {
      int treeBottom = area.y + area.height;
      item = tree.getTopItem();
      while (item != null) {
        Rectangle rect = item.getBounds();
        int itemBottom = rect.y + rect.height;
        if (rect.y <= point.y && point.y < itemBottom) return item;
        if (itemBottom > treeBottom) break;
        item = nextItem(tree, item);
      }
      return null;
    }
  }
  return item;
}

代码示例来源：origin: org.eclipse.platform/org.eclipse.swt.gtk.aix.ppc

Widget getItem(Tree tree, int x, int y) {
  Point point = new Point(x, y);
  point = tree.toControl(point);
  TreeItem item = tree.getItem(point);
  if (item == null) {
    Rectangle area = tree.getClientArea();
    if (area.contains(point)) {
      int treeBottom = area.y + area.height;
      item = tree.getTopItem();
      while (item != null) {
        Rectangle rect = item.getBounds();
        int itemBottom = rect.y + rect.height;
        if (rect.y <= point.y && point.y < itemBottom) return item;
        if (itemBottom > treeBottom) break;
        item = nextItem(tree, item);
      }
      return null;
    }
  }
  return item;
}

代码示例来源：origin: org.eclipse.platform/org.eclipse.swt.gtk.linux.s390x

Widget getItem(Tree tree, int x, int y) {
  Point point = new Point(x, y);
  point = tree.toControl(point);
  TreeItem item = tree.getItem(point);
  if (item == null) {
    Rectangle area = tree.getClientArea();
    if (area.contains(point)) {
      int treeBottom = area.y + area.height;
      item = tree.getTopItem();
      while (item != null) {
        Rectangle rect = item.getBounds();
        int itemBottom = rect.y + rect.height;
        if (rect.y <= point.y && point.y < itemBottom) return item;
        if (itemBottom > treeBottom) break;
        item = nextItem(tree, item);
      }
      return null;
    }
  }
  return item;
}

代码示例来源：origin: org.eclipse.platform/org.eclipse.jface

@Override
ViewerCell getInitialFocusCell() {
  Tree tree = (Tree) getViewer().getControl();
  if (! tree.isDisposed() && tree.getItemCount() > 0 && ! tree.getTopItem().isDisposed()) {
    ViewerRow aViewerRow = getViewer().getViewerRowFromItem(tree.getTopItem());
    if (tree.getColumnCount() == 0) {
      return aViewerRow.getCell(0);
    }
    Rectangle clientArea = tree.getClientArea();
    for (int i = 0; i < tree.getColumnCount(); i++) {
      if (aViewerRow.getWidth(i) > 0 && columnInVisibleArea(clientArea,aViewerRow,i))
        return aViewerRow.getCell(i);
    }
  }
  return null;
}

代码示例来源：origin: org.eclipse.scout.sdk.deps/org.eclipse.m2e.core.ui

void selectFirstElementInTheArtifactTreeIfNoSelectionHasBeenMade() {
 //
 // If we have started a new search when focus is passed to the tree viewer we will automatically select
 // the first element if no element has been selected from a previous expedition into the tree viewer.
 //
 if(searchResultViewer.getTree().getItemCount() > 0 && searchResultViewer.getSelection().isEmpty()) {
  Object artifact = searchResultViewer.getTree().getTopItem().getData();
  searchResultViewer.setSelection(new StructuredSelection(artifact), true);
 }
}

代码示例来源：origin: org.eclipse.scout.sdk.deps/org.eclipse.jface

@Override
ViewerCell getInitialFocusCell() {
  Tree tree = (Tree) getViewer().getControl();
  if (! tree.isDisposed() && tree.getItemCount() > 0 && ! tree.getTopItem().isDisposed()) {
    ViewerRow aViewerRow = getViewer().getViewerRowFromItem(tree.getTopItem());
    if (tree.getColumnCount() == 0) {
      return aViewerRow.getCell(0);
    }
    Rectangle clientArea = tree.getClientArea();
    for (int i = 0; i < tree.getColumnCount(); i++) {
      if (aViewerRow.getWidth(i) > 0 && columnInVisibleArea(clientArea,aViewerRow,i))
        return aViewerRow.getCell(i);
    }
  }
  return null;
}

代码示例来源：origin: org.eclipse.swt.cocoa.macosx/x86_64

TreeItem item = tree.getItem(pt);
if (item == null && (tree.getStyle() & SWT.FULL_SELECTION) == 0) {
  TreeItem currentItem = tree.getTopItem();
  TreeItem parentItem = currentItem.getParentItem();
  while (parentItem != null) {

代码示例来源：origin: org.eclipse.platform/org.eclipse.swt.gtk.aix.ppc

TreeItem item = tree.getItem(pt);
if (item == null && (tree.getStyle() & SWT.FULL_SELECTION) == 0) {
  TreeItem currentItem = tree.getTopItem();
  TreeItem parentItem = currentItem.getParentItem();
  while (parentItem != null) {

代码示例来源：origin: org.eclipse.scout.sdk.deps/org.eclipse.swt.win32.win32.x86

TreeItem item = tree.getItem(pt);
if (item == null && (tree.getStyle() & SWT.FULL_SELECTION) == 0) {
  TreeItem currentItem = tree.getTopItem();
  TreeItem parentItem = currentItem.getParentItem();
  while (parentItem != null) {

代码示例来源：origin: org.eclipse.platform/org.eclipse.swt.gtk.linux.ppc

TreeItem item = tree.getItem(pt);
if (item == null && (tree.getStyle() & SWT.FULL_SELECTION) == 0) {
  TreeItem currentItem = tree.getTopItem();
  TreeItem parentItem = currentItem.getParentItem();
  while (parentItem != null) {

代码示例来源：origin: org.eclipse.platform/org.eclipse.swt.gtk.linux.s390x

TreeItem item = tree.getItem(pt);
if (item == null && (tree.getStyle() & SWT.FULL_SELECTION) == 0) {
  TreeItem currentItem = tree.getTopItem();
  TreeItem parentItem = currentItem.getParentItem();
  while (parentItem != null) {

代码示例来源：origin: org.eclipse.swt.cocoa.macosx/x86_64

Rectangle itemRect = tree.getTopItem().getBounds();
TreeItem item = row;
int index = findIndex(tree.getItems(), item);
Rectangle itemRect = tree.getTopItem().getBounds();
TreeItem item = row;
int index = findIndex(tree.getItems(), item);

代码示例来源：origin: org.eclipse.platform/org.eclipse.swt.gtk.aix.ppc

Rectangle itemRect = tree.getTopItem().getBounds();
TreeItem item = row;
int index = findIndex(tree.getItems(), item);
Rectangle itemRect = tree.getTopItem().getBounds();
TreeItem item = row;
int index = findIndex(tree.getItems(), item);

代码示例来源：origin: org.codehaus.openxma/xmartclient

if (tree_.getItemCount() > 0) topItem = tree_.getTopItem();
if (topItem != null) {
  topKey = item2node(tree_.getTopItem()).key_;

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