我已经实现了一个自定义的datePickerTableCell来显示单元格编辑的日期选择器。我正在使用ExtFX DatePicker(https://bitbucket.org/sco0ter/extfx/overview)。一切正常,除非我手动输入日期而不是从选择器中选择它,我在commitEdit()上得到一个NullPointerException。
datePicker.setOnKeyPressed(new EventHandler<KeyEvent>() {
@Override
public void handle(KeyEvent t) {
if (t.getCode() == KeyCode.ENTER) {
if(getItem() == null) {
commitEdit(null);
} else {
commitEdit(getItem());
}
} else if (t.getCode() == KeyCode.ESCAPE) {
cancelEdit();
}
}
});
我发现这里出了什么问题。
答案 0 :(得分:1)
也许看看这个例子。它使用颜色选择器,但也适用于日期选择器:
public class ColorTableCell<T> extends TableCell<T, Color> {
private final ColorPicker colorPicker;
public ColorTableCell(TableColumn<T, Color> column) {
this.colorPicker = new ColorPicker();
this.colorPicker.editableProperty().bind(column.editableProperty());
this.colorPicker.disableProperty().bind(column.editableProperty().not());
this.colorPicker.setOnShowing(event -> {
final TableView<T> tableView = getTableView();
tableView.getSelectionModel().select(getTableRow().getIndex());
tableView.edit(tableView.getSelectionModel().getSelectedIndex(), column);
});
this.colorPicker.valueProperty().addListener((observable, oldValue, newValue) -> {
if(isEditing()) {
commitEdit(newValue);
}
});
setContentDisplay(ContentDisplay.GRAPHIC_ONLY);
}
@Override
protected void updateItem(Color item, boolean empty) {
super.updateItem(item, empty);
setText(null);
if(empty) {
setGraphic(null);
} else {
this.colorPicker.setValue(item);
this.setGraphic(this.colorPicker);
}
}
}
如果您使用的是Java 7,请将lambdas替换为匿名内部类,但它也可以正常工作。完整的博文是here。
答案 1 :(得分:0)
查看this example是否有帮助。它使用Java 8和DatePicker控件。
答案 2 :(得分:0)
This example也可能会有所帮助。它使用带有Java 8的DatePicker和TableView控件。
答案 3 :(得分:0)
当使用from tkinter import *
import tkinter
window = tkinter.Tk() #Here is where we set up the window and it's aesthetics,
window.title("BINARY-SUMZ!!!") #here we give the window a name,
window.geometry("1000x800") #here we give the window a size,
window.wm_iconbitmap('flower3.ico') #and here we give the window an icon.
def Destroy(): #this function destroys any widgets on the current page.
for widget in window.winfo_children():
widget.destroy()
def StartButton(): #This function starts the game after being clicked on.
print ("Game started from beginning.")
Intro() #This function starts the game after being clicked on.
def Menu(): #Creating a menu function
SumsTitle = tkinter.Label(window, text="BINARY-SUMS!!!", #Here is where we create the title for the menu screen, we give it a name,
fg = "light Green", #a foreground (text) color
bg = "tomato", #a backgorund color
font = "'Bauhaus 93 bold italic")
SumsTitle.pack() #and the text is given a font.
StartButtonWid = tkinter.Button(window, text = "Start Learning!!!",
fg = "tomato",
command= (StartButton))
StartButtonWid.pack() #Setting up the button for the start of the game.
TitleCanvas = tkinter.Canvas(window, bg = "light blue" ,
height = 1000,
width = 1000)
TitleCanvas.pack()
def Intro():
Destroy() #This function works fine
SumsTitle = tkinter.Label(window, text="Welcome!!!", #Here is where we create the title for the menu screen, we give it a name,
fg = "light green", #a foreground (text) color
bg = "tomato", #a backgorund color
height = 1,
width = 14,
font = "'Bauhaus 93 bold italic")
SumsTitle.pack()
Intro1 = tkinter.Label(window, text='Welcome to BINARY-SUMS!!! The fun, interactive binary learning game! in this game we will be learning about language based topics',
font= "30")
Intro1.pack()
Intro2 = tkinter.Label(window, text='that will be vital to know in your AS computing or computer science exams. Please click the screen to continue.',
font= "30")
Intro2.pack()
IntroCanvas = tkinter.Canvas(window, bg = "light blue" ,
height = 1500,
width = 1000)
IntroCanvas.bind("<Button-1>", Activ1())
IntroCanvas.pack()
def Activ1():
Destroy() #this function crashes.
if __name__ == "__main__":
Menu()
tkinter.mainloop()
作为表格单元格时,我遇到了类似的问题。问题是我在TextArea
实施中使用startEdit
。使用TableCell
代替TableView#edit
解决了这个问题。