Recently, I have been working on a game project and decided to learn how to make a gui from scratch in love2d while I was at it. I decided to use OOP where I had menu objects and button objects within the menu objects. I had a problem where I only wanted to draw the buttons only if the menu was active. The easiest/best way to do this is probably to have a function in the menu object that checks if the menu is active and draw the buttons if it is like this...
menu = {
-- menu stuff
button = require("path")
active = false,
buttons = {}
}
function menu.newButton()
--create new button object from button table
end
function menu:drawButton()
if self.active then
for k,v in pairs(buttons)
menu.buttons[k]:draw() -- some draw function that sets the size, pos, and color of the button
end
end
end
This got me wondering though. Is there some way to check values in the menu's table from a function located in the button's table?
You can use composition to access properties of Menu object from a Button. To do that you would need to pass a reference to the menu object when constructing every new Button. For instance:
Button = {}
function Button.new (menu)
return setmetatable({menu = menu}, {__index = Button})
end
function Button:getMenuName()
return self.menu.name
end
menu = {
name = "menu1",
buttons = {},
}
function menu:newButton ()
local button = Button.new(self)
table.insert(self.buttons, button)
return button
end
local btn = menu:newButton()
print(btn:getMenuName())
Would print the property name of menu from object btn.
Related
I developed a VSTO 4 add-in for Excel. It works perfect, however, I have a button placed in the custom tab of its Ribbon control that is initially disabled.
After clicked other ribbon button in my custom tab, I need to enable the initially disabled button.
I tried with:
btnCancelar.Visible = true;
In the Click event of a button, but button is not shown. The strange thing is that when debugging, it still does not appear, but if a MessageBox is shown, the button get visible at last.
I don't understand this behaviour. How can I enable or disable a ribbon button dynamically by code?
I'm not sure what your language is used in your project, but I guess you can tranform it to your own language used. I'll show the example here in C#:
First you need to implement a so called Callback function in the RibbonXML definition:
<button id="buttonSomething" label="Content" size="large" getVisible="EnableControl"/>
then the next step is to implement the Callback function:
public bool EnableControl(IRibbonControl control)
{
return true; // visible ... false = invisible
}
VSTO will trigger the getVisible Callback and depending on the return value enable or disable the visible state (don't forget to remove any Visible property from the RibbonXML, otherwise the Callback is not triggered)
In case of the Ribbon Designer you need to make sure your Click signature is correct, the easies way to do that is by double clicking the button on the ribbon designer. This will create the Click method for you, for instance:
I created a Ribbon with the Ribbon designer and added two buttons. Double clicked the first button to get an empty method like below, and added the code.
private void button1_Click(object sender, RibbonControlEventArgs e)
{
// Toggle button visibility and make sure the button is enabled
// Visible (obviously) makes it visible, while Enabled is grayed if
// false. You don't need this it is Enabled by default, so just for
// demo purposes
button2.Visible = !button2.Visible;
button2.Enabled = button2.Visible;
// Force Ribbon Invalidate ...
this.RibbonUI.Invalidate();
// Long running proces
}
This worked perfectly for me, so if it doesn't work for you please provide more details of your coding.
I have created a workaround to this.
It was simple. Just started the long running process in different thread. That way, cancel button is shown when it should and then hidden after the process ends.
I used this code to launch the process in the Ribbon.cs code:
btnCancelar.Visible = true;
Action action = () => {
Formatter.GenerateNewSheet(Formatter.TargetType.ImpresionEtiquetas, frm.CustomerID, workbook, btnCancelar);
};
System.Threading.Tasks.Task.Factory.StartNew(action);
And inside the process method I have this code:
public static bool GenerateNewSheet(TargetType type, string customerID, Excel.Workbook workbook, Microsoft.Office.Tools.Ribbon.RibbonButton btnCancelar)
{
try
{
_cancelled = false;
InfoLog.ClearLog();
switch (type)
{
case TargetType.ImpresionEtiquetas:
return GenerateTagPrinting(customerID, workbook);
}
return false;
}
finally
{
btnCancelar.Visible = false;
}
}
The interesting thing here I have discovered is that Excel is thread safe, so it was not necessary to add a synchronization mechanism neither when adding rows in the new sheet nor when setting Visible property to false again.
Regards
Jaime
i have developed a simple calculator like in windows calculator,
but unlike in windows calculator, after clicking any button, the focus on that button is still there on the particular clicked button.
so how to never get focus for all buttons on calculator form ... ?
i don't think that it will better to write loose focus code on every button's click event ... so any better solution ?
Without seeing any code of yours, I am going to assume that you have a text box that displays the numbers pressed by the user, so you need to set the focus to the text box once a user clicks a button, like this:
TextBox1.Focus()
Note: If your text box is not named TextBox1, then change the name to whatever your text box is actually named.
Instead of a standard button use an instance of a NoFocusButton class derived from the Standard button. In this class override the ShowFocusCues property and return always false.
Form f = new Form();
// Need to add manually the buttons to your form unless you build a customcontrol
NoFocusButton b = new NoFocusButton();
b.Text = "ClickMe";
f.Controls.Add(b);
f.Show();
// Class derived by the Button control, it is identical but the
// property that control the drawing of the Focus rectangle returns FALSE
// tricking the WinForm system to avoid to draw the focus rectangle
class NoFocusButton : System.Windows.Forms.Button
{
protected override bool ShowFocusCues
{
get
{
return false;
}
}
}
The credit goes to Remove Focus Rectangle from Button
I can markup a Heading or ListItem to have a moveTo attribute and that transition works perfectly.
Is there a way perform a transition to a named view programmatically say, on a button click?
Somewhere on the net I found below code, but its not working. I need something similar to this -
function moveTo(){
var w = dijit.byId('currentView');
w.performTransition('#newView',1,"fade",null);
}
This code sample registers an onclick event handler on a button with the id "ButtonID". After pressing the button, a lookup in the dijit registry will be performed to find the displayed view.
You can call the function performTransition(...) on any dojox.mobile.View.
require(["dijit/registry"], function(registry) {
dojo.ready(function() {
// Button Listener
registry.byId("ButtonID").on("click", function(){
var oldView = dijit.registry.byId("ID_View1");
oldView.performTransition("ID_View2", 1, "slide", null);
});
});
But:
Changing "moveTo" parameters programmatically is much more difficult than performing transitions between views. You have to do some nasty things to override the moveTo Attribute of a widget like for example a Backbutton in a dojox.mobile.Heading
var heading1 = dijit.registry.byId("ID_Heading");
heading1.destroyDescendants();
heading1.moveTo = viewId;
heading1.backButton = false;
heading1._setBackAttr("Zurück");
I'm trying to create a menu in VB.Net where one item in the menu has a submenu that sprouts off to the side when the user hovers over it. In other words, a completely ordinary submenu that everyone's used a million times.
My main menu items are of class ToolStripMenuItem. I can get close to the behavior I want by using the item's "DropDown" member. This creates the submenu behavior correctly, but I also need to be able to check and uncheck the items in the submenu. I've set the submenu items' "CheckOnClick" property to True, but checkboxes are still not displayed when I run the program.
Is it possible to get this behavior? Is it possible with ToolStripMenuItem?
Here's the code I currently have, which gets close, but doesn't give me checkboxes:
Dim mainItem As ToolStripMenuItem = New ToolStripMenuItem()
mainItem.Text = "Click For Submenu"
Dim subMenu As ToolStripDropDown = New ToolStripDropDown()
For Each item As ToolStripMenuItem In listOfItems
item.CheckOnClick = True
subMenu.Items.Add(item)
Next
mainItem.DropDown = subMenu
Try getting rid of that subMenu variable and change the code this way:
For Each mi As ToolStripMenuItem In listOfItems
mi.CheckOnClick = True
mainItem.DropDownItems.Add(mi)
Next
I have a GTK notebook with multiple tabs. Each tab label is a composite container containing, among other things, a button I want to use to close the tab. The button has a handler for the "clicked" signal.
When the signal is called, I get the button widget and "EventArgs" as a parameter.
I need to determine the page number based on the button widget, but myNotebook.PageNum(buttonWidget) always returns -1. I've even tried buttonWidget.Parent which is the HBox which contains the widget.
Any ideas on what I can do or what I am doing wrong?
One easy work around is to pass the page number to your button's Clicked event as you construct the buttons.
for (int page = 0; page < n; page++){
int the_page = page;
NotebookPage p = new NotebookPage ();
...
Button b = new Button ("Close page {0}", the_page);
b.Clicked += delegate {
Console.WriteLine ("Page={0}", the_page);
};
}
The "the_page" is important, as it is a new variable that will be captured by the delegate.