Background: I have a few tabs set up in my GtkNotebook, and when certain conditions are met on the main tab, then input fields in the 'test signals' tab are accordingly disabled.
When the input inside a GtkSpinButton is highlighted on the 'test signals' tab and the GtkSpinButton's property sensitive is set to false, the text within the GtkSpinButton remains highlighted. Because sometimes there are no other editable fields on this tab, the text remains highlighted until another widget has its property sensitive set to true.
This just looks sloppy to me, so I would like to stop this behavior and have the widgets that are set to sensitive = false all cleared of focus or highlighting. Any idea how to un-highlight the text within the GtkSpinButton, maybe before setting sensitive = false?
To get rid of a selection you can use the gtk_editable_select_region() function. This is a method on GtkEditable, an interface that both GtkEntry and GtkSpinButton satisfy. You can convert either of these to GtkEditable with GTK_EDITABLE(). For example:
gtk_editable_select_region(GTK_EDITABLE(spinbutton), 0, 0);
Related
I am feed up with this Oracle APEX application , their is no proper videos or documentation
I have a Text area field and button
On button click I have written a PL/SQL code to send mail
Is their any way I can populate error / success message on screen
If text area is empty does not have any data then display error message on screen as Text area field is empty
My code :
BEGIN
if (:textarea1 is not null ) then
APEX_MAIL.SEND(p_from => 'alice#example.com',
p_to => 'bob#example.com',
p_subj => 'Email from Oracle Autonomous Database',
p_body => 'Sent using APEX_MAIL');
else
--popup error message on my screen -> `textarea` filed cannot be empty
end if;
END;
The following package of ADD_ERROR.ADD_ERROR does not exist at my end
If text area is empty does not have any data then display error message on screen
You don't need your own validation for that; just set that item's Value required property ON.
Additionally, you can even set process' Server side condition to
When button pressed: pick the button you use to send an e-mail
Type: Item is not null; pick the text area item
You commented that it isn't working. Well, it is. If it doesn't for you, then you did something wrong (although, I can't imagine what would that be, regarding the fact that it is just one property you had to set).
So: if I leave the text area empty and push the button, error message is here:
As of a video with demonstration: I don't have any. Google for it, if you desperately need it.
My environment is Python 2.7, running on Windows 7.
I'm trying get a Tkinter Listbox to trigger a callback in response to the user changing the 'active' item (i.e. the item with focus). I'm using a binding to the <<ListboxSelect>> event to make this happen, and it's working -- sort of.
The callback itself is supposed to check what the new active item is, and carry out some processing accordingly. This logic operates the way I expect when I change the active item via the up/down arrow keys. But when I point & click on a new item instead, the code mistakenly identifies the prior active item as the current one.
Here's a stripped-down code sample that illustrates the behavior I'm getting:
import Tkinter as tk
#Root window
root = tk.Tk()
#Callback to show focus change
def updateDisplay(*args):
focusIndex = str(lb.index(tk.ACTIVE))
ctrlFI.set('Focus is at index '+focusIndex)
#Control variables
ctrlLB = tk.StringVar()
ctrlFI = tk.StringVar()
#Widgets
lb = tk.Listbox(root,
width=20, height=10,
relief=tk.FLAT,highlightthickness=0,
selectmode=tk.EXTENDED,
activestyle='dotbox',
listvariable=ctrlLB)
lbl = tk.Label(root,
justify=tk.LEFT, anchor=tk.W,
textvariable=ctrlFI)
lb.grid(row=0,column=0,sticky=tk.NW,padx=(5,0),pady=5)
lbl.grid(row=1,column=0,columnspan=2,sticky=tk.NW,padx=5,pady=5)
#Listbox binding to trigger callback
lb.bind('<<ListboxSelect>>',updateDisplay)
#Initializations to prep GUI
ctrlLB.set('Index0-entry Index1-entry Index2-entry Index3-entry Index4-entry')
ctrlFI.set('Ready')
#Begin app
tk.mainloop()
Here are the results when you use the arrow keys:
But here's what you get when you click with the mouse:
The information 'lags' one behind, showing the prior selection instead. (If you click the same item a second time, it 'catches up.')
So my questions are:
What is causing the discrepancy?
How do I fix it so the mouse click gives the right result?
The active item is not necessarily the same as the selected item. When you press the mouse down it changes the selected value but it does not change the active item. The active item only changes once you release the mouse button.
You should be able to see this by clicking and holding the mouse button over an item that is not currently selected. When you do, you'll see something like this:
In the above image, the active item is the one surrounded by a dotted outline. The selected item is in blue. When your code displays the 'focus', it's displaying the active element rather than the selected element.
If you want the selected item, you need to use curselection to get the index of the selected item. It returns a tuple, so in extended mode you need to get the first element that is returned (eg: lb.curselection()[0]). Be sure to handle the case where curselection returns an empty string.
I use setEditable(true) to make QComboBox editable, when I input cy, then the completer's popup view will be visible and lists all possible results like: cyan, cyana, liecyan ... But when I press Down in keyboard (Qt::Key_Down), the first one cyan will be selected and QComboBox's lineedit's text will be set cyan , meanwhile, completer's popup view updates, only cyan shows. How can I customize it to make it behave like web's select component.
I have solved this question.
1.class MyListView : public QListView
2.MyListView's bool event(...) need to be implemented to concern about type is QEvent::ShortcutOverride
3.based on QEvent::ShortcutOverride, when user press Qt:Key_Up or Qt::Key_Down,setfalg false, when user release key,set flag true
3.QCompleter use setPopup(MyListView's instance) to override default listview
4. set QCompleter's regexp to work when falg is true
5.I got what I want
Question/Problem: I have an edit control (text box) that the user enters a username into. I am attempting to compare the username entered to the ones listed in my List Control. If the username given matches, my button's text should change from Create User to Update User.
My problem is in finding the correct event/time to compare the strings, without creating an infinite loop.
What I have tried: I have tried using the edit control events EN_CHANGE and EN_UPDATE. Both of these events cause stack-overflow exception or an infinite loop. I thought that one of these events would be called every time something is typed or the backspace was used within my edit control.
In my EN_CHANGE / EN_UPDATE event, I compare the username strings and set the button's text. With either event, it is called infinite times:
void Users::OnEnUpdateLoginName() //EN_UPDATE Event
{
bool match = false;
//Compare the edit control text with each List Control text.
for(int i = 0; i<m_UserList.GetItemCount(); i++)
{
if(strcmp(m_UserList.GetItemText(i,0),m_loginName)==0)
match = true;
}
//If the usernames match, change the button's text to "Update User"
if(match)
{
CWnd *currentSelection = GetDlgItem(TXTC_LOGIN_NAME);
currentSelection->SetWindowTextA("Update User");
}
else
{
CWnd *currentSelection = GetDlgItem(TXTC_LOGIN_NAME);
currentSelection->SetWindowTextA("Create User");
}
}
.
If the text in red matches, change the text of the button highlighted in blue.
Should I be using a different event to validate the string in real-time as the user types?
My code had two issues. I needed to use UpdateData, so that data for all my dialog controls would be current. I also was updating the wrong variables. Thanks #rrirower
In a dialog box I have a combo box and a text field. I would like to make so that if one particular value in the combo box is selected, the text field would be disabled (or hidden), and if another value is selected, the text field would be enabled.
I have:
self.myCombo = wx.ComboBox(parent=self, choices=['value1', 'value2'], style = wx.CB_READONLY)
self.myCombo.Bind(wx.EVT_COMBOBOX, self.onChange)
# ...
def onChange(self, ev):
self.myTextField.Enable(False) if self.myCombo.GetValue() != "value1" else self.myTextField.Enable(True)
And this does work like a charm, the text field gets enabled and disabled.
However, I would like to have the text field enabled or disabled depending on the initial value of the combo box, meaning the value gotten from a config file and selected when the dialog box is open.
I've tried the same:
self.myTextField = wx.TextCtrl(parent=self)
self.myTextField.Enable(False) if self.myCombo.GetValue() != "value1" else self.myTextField.Enable(True)
but this doesn't work. I've tried GetSelection also, but when logging this, both GetValue and GetSelection return -1.
The combobox probably isn't fully initialized yet when you try to query it. If you want to disable it when it loads, you don't have to check its value. Just disable it. But for what you want to do, I would recommend using wxPython's wx.CallAfter() method.
Something like the following should suffice:
def __init__(self):
# initialize various variables
wx.CallAfter(self.check_combobox, args)
def check_combobox(self, args):
self.myTextField.Enable(False) if self.myCombo.GetValue() != "value1" else self.myTextField.Enable(True)