我建模了 TreeView<Playlist>
这样,具有子节点的节点就有一个图形文件夹图标,而其他节点则有一个播放列表图标。样式几乎可以工作,但是当展开/折叠节点时,图形图标会损坏。
当单击节点时,它始终显示正确的样式,但是当展开/折叠或添加新节点时,TreeView
像这样操作:
这是定义 TreeCell
的代码的一部分在 TreeView
public class PlaylistTreeView extends TreeView<Playlist> {
public PlaylistTreeView() {
...
setShowRoot(false);
setCellFactory(treeView -> new PlaylistTreeCell());
...
}
private class PlaylistTreeCell extends TreeCell<Playlist> {
@Override
public void updateItem(Playlist p, boolean empty) {
super.updateItem(p, empty);
if(p == null || empty) {
textProperty().unbind();
setText("");
setGraphic(null);
}
else {
if(p.isFolder())
setId("playlist-folder-tree-cell");
else
setId("playlist-tree-cell");
textProperty().bind(p.nameProperty());
}
}
}
}
这些是影响这些组件的唯一样式 css
:
.tree-cell, .list-cell {
-fx-background-color: rgb(243, 243, 243);
}
#playlist-tree-cell {
-fx-graphic: url('../icons/playlist-black-icon.png');
}
#playlist-tree-cell:selected {
-fx-graphic: url('../icons/playlist-white-icon.png');
}
#playlist-folder-tree-cell {
-fx-graphic: url('../icons/playlist-folder-black-icon.png');
}
#playlist-folder-tree-cell:selected {
-fx-graphic: url('../icons/playlist-folder-white-icon.png');
}
.list-cell:selected, .tree-cell:selected {
-fx-background-color: black;
-fx-text-fill: white;
}
我在这里缺少什么?
最佳答案
我使用CSS伪类解决了这个问题。
public class PlaylistTreeView extends TreeView<Playlist> {
private PseudoClass playlist = PseudoClass.getPseudoClass("playlist");
private PseudoClass playlistSelected = PseudoClass.getPseudoClass("playlist-selected");
private PseudoClass folder = PseudoClass.getPseudoClass("folder");
private PseudoClass folderSelected = PseudoClass.getPseudoClass("folder-selected");
public PlaylistTreeView() {
setShowRoot(false);
setCellFactory(treeView -> new PlaylistTreeCell());
}
private class PlaylistTreeCell extends TreeCell<Playlist> {
public PlaylistTreeCell() {
super();
ChangeListener<Boolean> isFolderListener = (obs, oldPlaylist, newPlaylist) -> {
boolean isFolder = newPlaylist.booleanValue();
boolean isSelected = selectedProperty().get();
updatePseudoClassesStates(isFolder, isSelected);
};
ChangeListener<Boolean> isSelectedListener = (obs, oldValue, newValue) -> {
boolean isFolder = itemProperty().getValue().isFolder();
boolean isSelected = newValue.booleanValue();
updatePseudoClassesStates(isFolder, isSelected);
};
itemProperty().addListener((obs, oldPlaylist, newPlaylist) -> {
if(oldPlaylist != null) {
textProperty().unbind();
setText("");
oldPlaylist.folderProperty().removeListener(isFolderListener);
selectedProperty().removeListener(isSelectedListener);
}
if(newPlaylist != null) {
textProperty().bind(newPlaylist.nameProperty());
newPlaylist.folderProperty().addListener(isFolderListener);
selectedProperty().addListener(isSelectedListener);
updatePseudoClassesStates(newPlaylist.isFolder(), selectedProperty().get());
}
else {
pseudoClassStateChanged(folder, false);
pseudoClassStateChanged(folderSelected, false);
pseudoClassStateChanged(playlist, false);
pseudoClassStateChanged(playlistSelected, false);
}
});
}
private void updatePseudoClassesStates(boolean isFolder, boolean isSelected) {
pseudoClassStateChanged(folder, isFolder && !isSelected);
pseudoClassStateChanged(folderSelected, isFolder && isSelected);
pseudoClassStateChanged(playlist, !isFolder && !isSelected);
pseudoClassStateChanged(playlistSelected, !isFolder && isSelected);
}
}
style.css
文件:
.tree-cell, .list-cell {
-fx-background-color: rgb(243, 243, 243);
}
.tree-cell:empty {
-fx-graphic: none;
}
.tree-cell:playlist {
-fx-graphic: url('../playlist-black-icon.png');
}
.tree-cell:playlist-selected {
-fx-graphic: url('../playlist-white-icon.png');
}
.tree-cell:folder {
-fx-graphic: url('../playlist-folder-black-icon.png');
}
.tree-cell:folder-selected {
-fx-graphic: url('../playlist-folder-white-icon.png');
}
.tree-cell:playlist-selected, .tree-cell:folder-selected {
-fx-background-color: black;
-fx-text-fill: white;
}
关于java - TreeView 展开/折叠奇怪的行为,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/37472368/