I am trying to set TextView width dynamically, Using setWidth(width) method.
txtviewOne.setWidth(10);
txtviewTwo.setWidth(10);
But not success.
Please help me How can I set width of textview dynamically.
TextView tv;
----------------------
tv=new TextView(this); // or tv=new TextView(R.id.textview1);
LinearLayout.LayoutParams Params1 = new LinearLayout.LayoutParams(15,50);
tv.setLayoutParams(Params1);
I call new TableRow(), because textView's parent is TableRow. If your parent's view is LinearLayout, replace it by new LinearLayout.LayoutParams.
textView.setLayoutParams(
new TableRow.LayoutParams(
LayoutParams.WRAP_CONTENT,
LayoutParams.MATCH_PARENT));
I have experienced something similar in situations where there is a ScrollView in the parents hierarchy. No matter how I would modify layout inside it, my commands were ignored. If this is the case, try calling RequestLayout on the ScrollView or remove and re-add the child view of the ScrollView.
Related
So, I have few steps, last one contains EnvironmentObject and ObservedObject. The issue is, when I try to modify EnvironmentObject (lane 68) it re-creates ObservedObject.
Can any one explain me why this happens? Any solution to keep my ObservedObject with original state?
As far as I know it possible to change ObservedObject to StateObject, but I am using iOS 13+ so... I need other solution.
Line 47 - body is reevaluated so new instance of ObservedStuff is created, so make it as property and pass it in, like
struct TestView_A: View {
...
private let model = ObservedStuff()
var body: some View {
NavigationLink(destination: TestView_B(viewModel: self.model) ...
}
}
I add Left Navigation Back button in collection view controller with code.
//Add Navigation Bar
navbar.autoresizingMask = [.flexibleWidth, .flexibleBottomMargin, .flexibleRightMargin]
navbar.delegate = self
UINavigationBar.appearance().barTintColor = UIColor(red: 0.0/255.0, green:49.0/255.0, blue:79.0/255.0, alpha:0.1)
UINavigationBar.appearance().tintColor = UIColor.white
UINavigationBar.appearance().isTranslucent = true
UINavigationBar.appearance().titleTextAttributes = [NSForegroundColorAttributeName : UIColor.white]
navItem.title = prefs.value(forKey: "PROVIDER_NAME") as! String?
let image = UIImage(named: "back_image")
navItem.leftBarButtonItem = UIBarButtonItem(image: image, style: .plain, target: self, action: #selector(addTapped))
navItem.leftBarButtonItem?.imageInsets = UIEdgeInsetsMake(0, 0, 0, 0)
Back button is so close to the left. I would like to add padding about 10px from the left. So, I changed the code into
navItem.leftBarButtonItem?.imageInsets = UIEdgeInsetsMake(0, 15, 0, 0)
but it is not working and image Back button looks smaller. How can I do to add space to the left of Back button?
I would recommend replacing UINavigationBar with a simple UIView. This way you would gain a full control over the layout of the navigation bar. It wouldn't be anything more than a transparent UIView with a back button and a title label inside. As simple as that.
The real UINavigationBar is more than that. It's meant to manage a stack of UINavigationItem objects. It adjusts itself depends on the current item and knows how to make an animated (and even interactive) transition from one state to another. That's why you can't change much about the bar's appearance. You shouldn't treat it as a regular view.
UPDATE
Another way to achieve this is a little tricky. You can implement it completely from a storyboard and you don't need mess with appearance.
Add UINavigationBar to a view controller.
Add a plain UIView to the left side of UINavigationBar and make its background color completely transparent.
Add UIButton to the view added in the previous step and set a back icon as its image.
Add constraints to the button to align it to the right side of its superview.
Adjust the width of the view so the back button position is exactly where you want it to be.
This is a view hierarchy in the storyboard:
This is how your UINavigationBar will look like (for you the background will be transparent):
I'm experiencing this weird behaviour once I initiate an application root controller with a UINavigationController
On first launch, there is an empty space between the navigationbar and first viewcontroller controller.
but the full content is displayed after I swtiched to another view and back to the first one.
Is something wrong with this?
tab_bar_controller = RootViewController.alloc.initWithNibName(nil, bundle:nil)
#window.rootViewController = UINavigationController.alloc.initWithRootViewController(tab_bar_controller)
Thanks for your help.
It is not considered "proper" to put a UITabBarController inside a UINavigationController:
UINavigationController#initWithRootViewController ... rootViewController:
The view controller that resides at the bottom of the navigation stack.
This object cannot be an instance of the UITabBarController class.
The opposite - a UINavigationController as one of the UITabBarController child view controllers - is allowed.
nav_controller = RootViewController.alloc.initWithNibName(nil, bundle:nil)
#window.rootViewController = UITabBarController.alloc.init
#window.rootViewController.viewControllers = [nav_controller]
Even if you did get this figured out, your app would ultimately be rejected.
Try placing the content in the viewWillAppear callback.
I have a weird problem that I can't seem to solve. I've got a JList which has to be able to scroll if there are more items in it then can be displayed. However if I put the JList in a JScrollPane, it doesn't utilise the full height of the EAST part of the BorderLayout it's in.
Example without JScrollPane:
public UsersPanel(){
String[] userList = new String[]{"Foo","Bar","Foo","Bar","Foo","Bar","Foo","Bar","Foo","Bar","Foo","Bar","Foo","Bar"};
JList users = new JList(userList);
add(users);
}
Example with JScrollPane:
public UsersPanel(){
String[] userList = new String[]{"Foo","Bar","Foo","Bar","Foo","Bar","Foo","Bar","Foo","Bar","Foo","Bar","Foo","Bar"};
JList users = new JList(userList);
JScrollPane sp = new JScrollPane(users);
add(sp);
}
I want a JList that utilises the full available height of the EAST part of the BorderLayout it's in. I've tried wrapping my JList inside another JPanel, but that doesn't solve my problem either.
use setVisibleRowCount() method to set number of visible rows in Jlist.
users.setVisibleRowCount(10);
One hack that I've used successfully before is to add a ComponentListener to parent component of the JList / JScrollPane, and as it changes reset the preferred size of the JList and/or Jscrollpane via (pseudo-code) setPreferredSize(getPreferredSize().width, parentHeight)
I have a tab widget where every tab is a QTableView. I would like to be able to pass an updated model (QModelIndex) into each tab whenever the contents of that tab need to change.
The alternative (and nastier way) is for me to delete all the tabs, and then recreate them.
I know I can get the widget in the tab by doing something like:
tabWidget->widget(i);
This will return a widget, which is really a QTableView, but I want to update the model that is in that widget without having to delete and recreate the tab.
Thank you!
P.S. This is my current attempt...
for (int i = 0; i < tableView.size(); i++)
{
tabWidget->setCurrentWidget(tableView.at(i));
QTableView* updatedTable = (QTableView*)tabWidget->currentWidget();
updatedTable->setModel(dataModel);
tableView.replace(i, updatedTable);
}
It's not clear why you can't keep the QTableView widget and just change the model, as in your code. Doesn't the view refresh without this tableView.replace thing?
There doesn't appear to be a direct API for replacing the widget you put in with addTab() without going through a tab removal step. But instead of inserting the QTableView directly, you could instead call addTab() on a dummy widget that has a layout in it with a single item. A QStackedLayout, for instance:
QWidget* dummy = new QWidget;
QStackedLayout stackedLayout = new QStackedLayout;
stackedLayout->addWidget(tableView);
dummy->setLayout(stackedLayout);
tabWidget->addTab(dummy);
Then later, when you want to replace the tableView with a new one:
QWidget* dummy = tabWidget->currentWidget();
QStackedLayout newStackedLayout = new QStackedLayout;
newStackedLayout->addWidget(newTableView);
delete dummy->layout();
dummy->setLayout(newStackedLayout);
I still wonder what this is buying you that reusing the old table view couldn't do.