I want to allow user to select date from DateChooser upto current date. How can I disable future dates in DatePicker of JavaFX?
You should set a DayCellFactory. This allows you to control essentially all style elements of the datepicker, including whether or not dates after a specified date are greyed out.
datePicker.setDayCellFactory(param -> new DateCell() {
#Override
public void updateItem(LocalDate date, boolean empty) {
super.updateItem(date, empty);
setDisable(empty || date.compareTo(LocalDate.now()) > 0 );
}
});
PS: any node that has cells in it (TableView, DatePicker, ListView etc) can have its updateItem method overridden, which allows you to configure the style of that cell based on its data. Use with caution, and always make sure you include the super.updateItem() that comes with it.
Related
I have a TreeTableView and I have a custom TreeTableCell in which I override the updateItem method in order to render my cells(set disabled or enabled) depending on some condition. The problem is if I do some scroll, the table doesn't refresh, and as you can see on the attached image some cells become disabled even if they don't satisfy the condition. After heavy scrolling all cells become disabled(grayed out). I tried two things to solve the problem:
add some event listeners to refresh the table "manually" like:
treeTable.addEventFilter(ScrollEvent.ANY, event -> treeTable.refresh());
the rendering problem disappears, but if I do a little heavier scrolling, it becomes so laggy like if the application runs on 10-15 fps because the refreshing event triggers too frequently.
The other thing that I have tried is to make a timer(java.util.Timer) to trigger the refresh for example in only every 50 milliseconds, while scrolling. Then the lag disappears but there is a delay on rendering the cells, so you can observe the change of the cell color from gray to white.
If i choose smaller time interval it becomes laggy, and i could't find a balance between the lag and delay, and I also think both of my solutions are just workarounds, not real solutions for the problem.
Do you have any other idea to solve this problem?
The attached image : TableCells
#Override
public void updateItem(Boolean item, boolean empty) {
MyCustomRow row = getTreeTableRow().getItem();
if (row != null && row.isCondition()) {
editableProperty().set(false);
super.updateItem(item, empty);
}
}
Your updateItem method must:
Always call super.updateItem(), and
Update the state of the cell so that it is consistent for any possible values of item and empty
(see the Cell documentation.)
In your code, if the cell is used for a row where isCondition returns true, and then subsequently reused for a row where isCondition returns false, you don't revert the editable property to true. (So, eventually, all cells can be changed to non-editable, but can never be changed back to editable.)
You should do something like
#Override
public void updateItem(Boolean item, boolean empty) {
super.updateItem(item, empty);
MyCustomRow row = getTreeTableRow().getItem();
if (row != null && row.isCondition()) {
setEditable(false);
} else {
setEditable(true);
}
}
Starting from WinForms Data Grid v14.2 by enabling the GridOptionsMenu.ShowConditionalFormattingItem property, the Conditional Formatting feature becomes available.
By doing a right click on any column header, the Conditional Formatting menu item is showed up, allowing end-users to apply conditional formatting to grid columns.
My question is that is it possible to disable the feature for a specific column? I'm thinking of having the menu item grayed out, or simply not having it (by hiding it somehow) in the list of items.
I'm aware of the fact that the cells of a specific column can be formatted by the conditional formattings put on other columns by applying the formatting to the entire row. But, my goal is only to make sure the user can not access the functionality for a specific column.
You can remove the corresponding menu-item using the GridView.PopupMenuShowing event:
using System.Windows.Forms;
using DevExpress.XtraGrid.Localization;
using DevExpress.XtraGrid.Menu;
using DevExpress.XtraGrid.Views.Grid;
namespace WindowsFormsApplication2 {
public partial class Form1 : Form {
public Form1() {
InitializeComponent();
gridView1.PopupMenuShowing += gridView1_PopupMenuShowing;
}
void gridView1_PopupMenuShowing(object sender, PopupMenuShowingEventArgs e) {
var columnMenu = e.Menu as GridViewColumnMenu;
if(columnMenu != null && columnMenu.Column == this.gridColumn1) {
var conditionalFormattingItem = e.Menu.Items.FirstOrDefault(x => object.Equals(x.Tag, GridStringId.MenuColumnConditionalFormatting));
if(conditionalFormattingItem != null)
conditionalFormattingItem.Visible = false;
}
}
}
}
I'm sorry for mistake I'm french.
So I have a tableView empty. I have a button "Add" when on click added row in a tableView. And when I select an row in my tableView, a new button "Cancel" show.
And when I click on a button "Cancel", the row's css change on my row selected (added a class css ".cancel").
The problem is that I click on button "Cancel", and after I click in the button "Add", the css ".cancel" is applicated at an other row while I don't clicked in the button "Add".
I think that there is a problem in index row.
In my method initialize :
articleTable.setRowFactory(param -> new TableRow<LigneTicket>() {
#Override
protected void updateItem(LigneTicket paramT, boolean empty) {
super.updateItem(paramT, empty);
if (!isEmpty() && paramT != null && paramT.getArticle().isArticleCanceled()) {
getStyleClass().add("cancel");
}
}
});
my code on button "Cancel" :
public void cancelLigneTicket() {
int indexSelected = articleTable.getSelectionModel().getSelectedIndex();
articleTable.getItems().get(indexSelected).getArticle().setArticleAnnuler(true);
articleTable.getSelectionModel().clearSelection();
List<LigneTicket> items = new ArrayList<>(articleTable.getItems());
articleTable.getItems().setAll(items);
buttonAnnulArt.setVisible(false);
Help !!
Thanks.
TableRows are used to display the table items. That doesn't mean however, that it will be used with only one item.
This can result in the following sequence of events for a row r:
The item of r is updated to a canceled item and thus the cancel CSS class is added.
The item of r is updated to a non-canceled item, but the cancel CSS class is not removed.
You need to remove the class again. Furthermore with your code the style class could be added multiple times leading to unnecessary memory consumption.
boolean canceled = !empty && paramT != null && paramT.getArticle().isArticleCanceled());
if (canceled) {
if (!getStyleClass().contains("cancel"))
getStyleClass().add("cancel");
} else {
getStyleClass().remove("cancel");
}
or using PseudoClass:
private static final PseudoClass CANCELED = PseudoClass.getPseudoClass("cancel");
...
pseudoClassStateChanged(CANCELED, !empty && paramT != null && paramT.getArticle().isArticleCanceled());
Furthermore you should prefer the TableView.refresh (available in JavaFX >= 8u60) method to refresh the cell items instead of copying the list and setting the items.
I am using <mx:ComboBox /> and I want to select a matching item on the basis of string entered through keyboard. Currently, <mx:ComboBox /> selects the first matching item based on the first character only. I want this functionality to be customized. I am unable to find that KeyboardEvent listener which does the matching so that I can override it.
To do this yourself, you should look at the following bits and pieces of code below from the ComboBox and ListBase classes. ListBase is what the ComboBox component uses for it's drop down list.
The ComboBox appears to be deferring the keyboard input to the drop down list. It then listens for events from the drop down list to know when the selection has changed (as a result of keyboard or mouse input).
Flex components usually override a method called keyDownHandler() to process the keyboard input when they have focus. Starting there, we come across ComboBox line 2231:
// Redispatch the event to the dropdown
// and let its keyDownHandler() handle it.
dropdown.dispatchEvent(event.clone());
event.stopPropagation();
So now the keyDownHandler() in the drop down list will get executed. That method has a giant switch statement, where the default case statement on line 9197 of ListBase looks like this:
default:
{
if (findKey(event.charCode))
event.stopPropagation();
}
This is where the drop down list decides what to select based on keyboard input (when the input is not an arrow key or page up, etc.). The protected findKey() method simply calls the public findString() method to do this work.
So to override this behavior yourself:
extend the ListBase class and override the findKey() or findString() methods with your custom logic
extend ComboBox class and override the createChildren() method so you can instantiate your custom ListBase class instead of the default one.
Here is the class which I've used in order to make it work. searchStr is user inputted string which needs to be matched. If no dataprovider item gets matched to the searchStr, the overridden listener falls back to the default behaviour. I am using Timer to flush the inputted searchStr after 2 seconds. The possible drawback is that it is assuming the dataprovider to be a collection of String values. But you can modify it accordingly as the need may be.
public class CustomComboBox extends ComboBox
{
private var searchStr:String="";
private var ticker:Timer;
public function CustomComboBox()
{
super();
ticker = new Timer(2000);
ticker.addEventListener(TimerEvent.TIMER, resetSearchString);
}
override protected function keyDownHandler(event:KeyboardEvent):void
{
super.keyDownHandler(event);
// code to search items in the list based on user input.
// Earlier, the default behavior shows the matched items in the dropdown, based on first character only.
// user input is invisible to user.
if((event.charCode>=0x20 && event.charCode<=0x7E) || event.charCode==8) //Range of printable characters is 0x20[space] to 0x7E[~] in ASCII. 8 is ASCII code of [backspace].
{
ticker.reset();
ticker.start();
if(event.charCode==8)
{
if(searchStr=="")
return;
searchStr = searchStr.substr(0, searchStr.length-1);
}
else
{
searchStr += String.fromCharCode(event.charCode);
searchStr = searchStr.toLowerCase();
}
for each(var str:String in dataProvider)
{
if(str.toLowerCase().indexOf(searchStr, 0)>-1)
{
this.selectedItem = dropdown.selectedItem = str;
dropdown.scrollToIndex(dropdown.selectedIndex);
break;
}
}
}
}
/**
* reset the search string and reset the timer.
**/
private function resetSearchString(evt:TimerEvent):void
{
searchStr = "";
ticker.reset();
}
}
This problem has bugged me for several years and maybe someone here knows a simple solution, since I just ran into it again.
QUESTION: Is there any way to get the XtraGrid to "forget" the current focused row index before a new (different) datasource is assigned to the grid?
BACKGROUND
We use the XtraGrid as a kind of controller for what is displayed in another panel of a multipane Winform.
Now imagine a hypothetical scenario where the datasource of the XtraGrid keeps changing according to menu selections. Menu item 1 populates the grid with a list of today's entrees in the cafeteria: Id, Name. Menu item 2 populates the grid with a list of Customers the user must phone that day: ID, Name. Important thing is that these are separate distinct datasources, and the grid's datasource is being assigned and reassigned.
CRITICAL FACT FOR THIS QUESTION:
We want the grid's FocusedRowChanged event to be the single place where we trap the user's selection in the controller grid. We are a "no spaghetti code" shop. FocusedRowChanged is better than a click event because it handles keyboard navigation too. The row with the focus contains the ID of the detail record we need to fetch from the database for display in Panel #2. This works--most of the time.
Here's how it doesn't work: let's say that on a given day, the list of customers the user must contact contains only one row. So the first (and only) row in the grid is the focused row. Now let's say that the user goes up to the menu and selects the menu item to display the day's cafeteria entrees. When the user clicks on the first item in the Entrees list, the FocusedRowChanged event does NOT fire because the grid has retained a memory of the focused row index from the previous datasource. The focused row index has not changed. And thus the user's selection doesn't trigger anything.
I tried to get DevExpress to offer a second more row-object-oriented mode (as distinct from row-index-oriented approach) whereby each row in the grid would have a GUID, and the FocusedRowChanged event would fire whenever the GUID of the currently focused row differed from the GUID of the previously focused row, regardless of whether the focused row index happened to be the same. This would allow dynamic changes of datasource and enable the desired behavior. But they demurred.
So I'll ask my question again, Is there any way to get the XtraGrid to "forget" the current focused row index before a new datasource is assigned to the grid?
Tim, I had the exact same problem when the grid only had one row of data in it and then changed data sources. I solved it by setting the gridview.FocusedRowHandle = -1 after setting the new datasource.
In a similar situation, I am subscribing to the
FocusedRowObjectChanged
event (using DevExpress 16.1).
I think that the best solution to this problem is to create a new GridView object and override its DoChangeFocusedRowInternal method. Below you will find the default implementation of this method. All you need to do is to change the marked row just as your needs dictate. Also, take a look at the How to create a GridView descendant class and register it for design-time use article, it contains some useful information.
public class MyGridView : GridView {
protected override void DoChangeFocusedRowInternal(int newRowHandle, bool updateCurrentRow) {
if(this.lockFocusedRowChange != 0) return;
if(!IsValidRowHandle(newRowHandle))
newRowHandle = DevExpress.Data.DataController.InvalidRow;
if(FocusedRowHandle == newRowHandle) return; // <<<<<<
int currentRowHandle = FocusedRowHandle;
BeginLockFocusedRowChange();
try {
DoChangeFocusedRow(FocusedRowHandle, newRowHandle, updateCurrentRow);
}
finally {
EndLockFocusedRowChange();
}
RaiseFocusedRowChanged(currentRowHandle, newRowHandle);
}
}
UPDATE
My code:
namespace MyXtraGrid {
public class MyGridControl : GridControl {
protected override BaseView CreateDefaultView() {
return CreateView("MyGridView");
}
protected override void RegisterAvailableViewsCore(InfoCollection collection) {
base.RegisterAvailableViewsCore(collection);
collection.Add(new MyGridViewInfoRegistrator());
}
}
public class MyGridViewInfoRegistrator : GridInfoRegistrator {
public override string ViewName { get { return "MyGridView"; } }
public override BaseView CreateView(GridControl grid) {
return new MyGridView(grid as GridControl);
}
}
public class MyGridView : GridView {
public MyGridView(GridControl ownerGrid) : base(ownerGrid) { }
public MyGridView() { }
protected virtual bool RowEqual(int focusedRowHandle, int newRowHandle) {
if(IsDesignMode)
return focusedRowHandle == newRowHandle;
DataRow row1 = GetDataRow(focusedRowHandle);
DataRow row2 = GetDataRow(newRowHandle);
return row1 == row2;
}
protected override void DoChangeFocusedRowInternal(int newRowHandle, bool updateCurrentRow) {
if(this.lockFocusedRowChange != 0) return;
if(!IsValidRowHandle(newRowHandle))
newRowHandle = DevExpress.Data.DataController.InvalidRow;
if(RowEqual(FocusedRowHandle, newRowHandle))
return;
int currentRowHandle = FocusedRowHandle;
BeginLockFocusedRowChange();
try {
DoChangeFocusedRow(FocusedRowHandle, newRowHandle, updateCurrentRow);
}
finally {
EndLockFocusedRowChange();
}
RaiseFocusedRowChanged(currentRowHandle, newRowHandle);
}
}
}
You can subscribe on the DataSourceChanged event which will fire when Data source changes (you guessed it!) so then you can get using GetFocusedObject() the object and display the relevant items for the other grid...