I want to delete selected rows when the use click on a button.
so far the code looks like that:
this->grid_ = new wxGrid(parent, ...)
this->grid_->SetSelectionMode(wxGrid::wxGridSelectCells);
// Later, whene the button is clicked
this->grid_->SetFocus();
wxGridCellCoordsArray wx_cells = this->grid_->GetSelectedCells();
The problem is that the wx_cells variable is always empty whatever I select.
I tried with GetSelectedRows with no success.
I've added SetFocus and SetSelectionMode hoping it would help but it did not.
How can I get this to work ?
What version of wxgrid are you using? There seems to be an issue with old wxgrid that it always return empty when calling GetSelectedCells. Perhaps you can refer to http://forums.wxwidgets.org/viewtopic.php?t=6335 to try if it fits in your case.
Related
Let's say that I have a group of radio items in a wxMenu. I know that exactly one of these will be checked at any given time.
Does the wxMenu or some other construct hold onto the index of the checked item, or do I need to call the isChecked on each radio item till I find the checked element to find it's index?
I've asked this question about how to do that, but I'd much prefer wxWidgets saved me from doing that everywhere.
No, saving the index of the last selected item (as shown in ravenspoint's answer) or using wxMenuBarBase::IsChecked() until you find the selected radio button is the only way to do it.
For wxWidgets to provide access to the currently selected button it would need not only to store it (which means not forgetting to update not only when the selected changes, but also when items are inserted into/deleted from the menu, so it's already not completely trivial), but to somehow provide access to the radio items group you're interested in, which would require being able to identify it and currently there is no way to do it and adding it isn't going to be particularly simple.
What could be done easily, however, is writing a reusable function int GetIndexOfSelectedRadioItem(int firstItem) that would start at the given item and call IsChecked() on subsequent items until it returns true and return the offset of the item. You should be able to do it in your own code, but if you'd like to include such function in wxWidgets itself (as a static wxMenuBar method, probably), please don't hesitate to send patches/pull requests doing it!
It is easy enough to roll your own.
Bind an event handler to wxEVT_COMMAND_RADIOBUTTON_SELECTED for every button. In the handler, extract the ID of the selected radio button and store it somewhere.
Like this:
ResolMenu = new wxMenu();
ResolMenu->AppendRadioItem(idRcvLoRez,"Low Resolution");
ResolMenu->AppendRadioItem(idRcvMeRez,"Medium Resolution");
ResolMenu->AppendRadioItem(idRcvHiRez,"High Resolution");
ResolMenu->Check( idRcvLoRez, true );
Bind(wxEVT_MENU,&cFrame::onRcvRez,this,idRcvLoRez);
Bind(wxEVT_MENU,&cFrame::onRcvRez,this,idRcvMeRez);
Bind(wxEVT_MENU,&cFrame::onRcvRez,this,idRcvHiRez);
void onRcvRez( wxCommandEvent& event )
{
myRezID = event.GetId();
I'm making a program with Qt 4.8.5 on a Fedora system (unix). It's a QWizard structure with its QWizardPages.
I needed to change the default QWizard buttons (back, next, finish...) and customize it. I found I could do it putting the next lines on the constructor of my QWizard class called BaseWizard (class BaseWizard : public QWizard)
QList<QWizard::WizardButton> button_layout;
button_layout <<QWizard::Stretch << QWizard::CustomButton1 << QWizard::BackButton << QWizard::NextButton << QWizard::FinishButton;
this->setOptions(QWizard::NoDefaultButton);
With that what I have from left to right is one custom buttons, the back button, the next button and the finish button, and when I want I can show or hide the custom buttons with SetVisible() / SetDisabled() / setEnabled() functions.
That worked perfect for what I wanted until now... I have to make some changes to the program so I need to change those buttons depending on the page the user is. As I said before, I know I can change the visibility of CustomButton 1 for example BUT I can't do the same with back button so... my quesiton is: How can I decide which buttons I show in every QWizardPage (and their text) and which is the best way to do it?
I've tried creating a function on my BaseWizard
// Function to have only 2 custom buttons
void BaseWizard::ChangeButtons()
{
QList<QWizard::WizardButton> button_layout;
button_layout <<QWizard::Stretch << QWizard::CustomButton1 << QWizard::CustomButton2;
setButtonLayout(button_layout);
}
And then in the QWizardPage (lets call it WP) using it like:
BaseWizard *bz;
bz->ChangeButtons();
But when I do that nothing changes.I can still see the NextButon for example. I have tried also using first a button_layout.clear(); to see if clenaing it before adding the buttons works, but not.
I have also tried changing the text of CustomButton1. If I do it in the WP after calling ChangeButtons with
wizard()->button(QWizard::CustomButton1)->setText("TEXT CHANGED");
Then the text changes but if I put it in the ChangeButton() function with this->button(QWizard::CustomButton1)->setText("BBBBB"); it does nothing (But its entering into the funcion). Ofc if I try to change the text of CustomButton2 in WP nothing happens because I can't still see that button... so any idea of what I am doing wrong or how could I get what I try will be very apreciated,
Thank you so much.
Ok, I finally knew why was my program crashing... I put here the solution if anyone needs it in the future:
BaseWizard *bz; // <-- HERE is the problem
bz->ChangeButtons();
I was not initializing the pointer so it has to be changed to:
BaseWizard *bz = dynamic_cast<BaseWizard*>(wizard());
Ive made a search function for my List Control in Report View in my MFC Dialog. It looks like this
m_List.SetItemState((m_List.FindItem(&Finde)),LVIS_SELECTED,LVIS_SELECTED );
It searches the Content that is in the Variable Finde and marks it. Now it should mark the row. But I first have to click somewhere in the program. It doesnt mark the row directly after the function gets called.
Can anyone help me?
Here is the full function
LVFINDINFO Finde;
Finde.flags = LVFI_PARTIAL|LVFI_STRING;
Finde.psz = _T("Siffert");
if ((m_List.FindItem(&Finde)) != -1)
{
m_List.SetItemState((m_List.FindItem(&Finde)),LVIS_SELECTED,LVIS_SELECTED );
//m_List.SetSelectionMark((m_List.FindItem(&Finde)));
}
else
{
MessageBox(_T("No Results"));
}
You need to use the style LVS_SHOWSELALWAYS
Otheriwse the selection is only shown when the control has the focus and is active.
EDIT: Also keep in mind that there is also a LVIS_FOCUSED style, that also forces scrolling to this item.
This questions to me reeks of maybe a lack of understanding of C++, as the possibilities I've considered for my problem all seem to make no sense on why this could be occuring. Feedback appreciated.
I'm using the form designer to create a form class with a table in it. I'm trying to replace the table with another table generated in a helper class. I'm only doing this so I can (hopefully) maintain the nice grid layout I've designed, and through pointer manipulation, get the replacement I desire. Here's some code snippets from the table form constructor and relevant calls :
//tableData is defined in the header file as a QTableWidget*
tableData = this->findChild<QTableWidget *>("tableData");
....
setup();
void setup(){
tableData = Utilities::createTable(this->file, tableDelim);
//createTable returns QTableWidget*
... other assignments, and label text updates, which seem to all work
}
My understanding is that tableData is a pointer, and if printed, will give the address of the QTableWidget from the layout. So then if I create a QTableWidget* and then assign tableData to that, tableData should now point to the new widget. Instead, I see only a blank screen.
I tried checking what the tableData pointer is before I assign it to the new QTableWidget*, and after. The second pointer shown is what is generated by createTable() :
QTableWidget(0x101272d40, name = "tableData") QTableWidget(0x10127b3b0, name = "test_sample2.nuc.stats")
QTableWidget(0x10127b3b0, name = "test_sample2.nuc.stats") QTableWidget(0x10127b3b0, name = "test_sample2.nuc.stats")
It seems the pointer is being reassigned, but the table drawn isn't the right one.
What gives?
My understanding is that you want to design the table layout in designer but fill in the data from an external source.
I would suggest, to just use the QTableWidget that is created in setupUi() and modify Utilities::createTable() such that it becomes Utilities::populateTable(QTableWidget & table, <all the other parameters you need>). (Or use QTableWidget * if you prefer - however I like putting the non-zero assertion responsibility on the caller...)
Apart from that, I agree with Sebastian Lange.
You are right with your assumption. You do set a variable to be a pointer to a object and next you set the variable to be a pointer to another object. You never change any objects, just your variable which is not used to display anything.
You would need to do something like:
//tableData is defined in the header file as a QTableWidget*
tableData = this->findChild<QTableWidget *>("tableData");
parentLayout = tableData->parent()->layout(); //Get the parent widget to add another table.
parentLayout->removeWidget(tableData);
delete tableData;
parentLayout->addWidget(createTable());
You need to use pTheContainerOfTheOriginalTableWidget->addWidget(tableData); See here: http://qt-project.org/forums/viewthread/16547
Be sure you remove the original tableWidget so you don't have two (I assume you don't want two).
If I understand you correctly we have such situation.
call of setupUi (which generated by qt tootls),
there there is something like this(pseudo code):
oldTablePtr = new QTableWidget(parent);
someLayout->addWidget(oldTablePtr);
So parent and layout hold value of oldTablePtr.
And if you set variable oldTablePtr nothing changed.
parent send QPaintEvent to oldTablePtr.
So you need call delete oldTablePtr, that remove this widget from list of childs of parent, and move newTablePtr to the same layout.
There's no need to replace it in code, you can do it in Qt Designer. Just place QTableWidget on form, then rightclick it and choose Promote widget in menu, then you will need just enter your classname.
Currently I don't have Qt Designer near me, so edits will be appreciated.
I am using QT to create a chat messenger client. To display the list of online users, I'm using a QListWidget, as created like this:
listWidget = new QListWidget(horizontalLayoutWidget);
listWidget->setObjectName("userList");
QSizePolicy sizePolicy1(QSizePolicy::Preferred, QSizePolicy::Expanding);
sizePolicy1.setHorizontalStretch(0);
sizePolicy1.setVerticalStretch(0);
sizePolicy1.setHeightForWidth(listWidget->sizePolicy().hasHeightForWidth());
listWidget->setSizePolicy(sizePolicy1);
listWidget->setMinimumSize(QSize(30, 0));
listWidget->setMaximumSize(QSize(150, 16777215));
listWidget->setBaseSize(QSize(100, 0));
listWidget->setContextMenuPolicy(Qt::CustomContextMenu);
Users are shown by constantly refreshing the list, like this: (Note: There are different channels, with different userlists, so refreshing it is the most efficient thing to do, as far as I know.)
void FMessenger::refreshUserlist()
{
if (currentPanel == 0)
return;
listWidget = this->findChild<QListWidget *>(QString("userList"));
listWidget->clear();
QList<FCharacter*> charList = currentPanel->charList();
QListWidgetItem* charitem = 0;
FCharacter* character;
foreach(character, charList)
{
charitem = new QListWidgetItem(character->name());
// charitem->setIcon(QIcon(":/Images/status.png"));
listWidget->addItem(charitem);
}
}
This has always worked perfectly. The line that I commented out is the one I have problems with: my current goal is to be able to display a user's online status with an image, which represents whether they are busy, away, available, etc. Using setIcon() does absolutely nothing though, apparently; the items still show up as they used to, without icons.
I'm aware that this is probably not the way this function needs to be used, but I have found little documentation about it online, and absolutely no useful examples of implementations. My question is, can anybody help me with fixing this problem?
This is how you may conduct your debugging:
Try the constructor that has both icon and text as arguments.
Try to use that icon in another context to ensure it is displayable (construct a QIcon with same argument and use it elsewhere, e.g. QLabel!).
Use icon() from the QListWidgetItem to receive back the icon and then look at that QIcon.
Create a new QListWidget, change nothing, and ordinarily add some stock items in your MainWidget's constructor. See if the icons show up there.