As an old Borland C++ Bulder coder who has moved to Linux, I was very pleased to find QT and QT Creator.
But I have fallen at the first hurdle: I have designed a form, with some controls, and added a menu. Now, when the user selects menu File/Open, I would like to display a file selection dialog- and I can't see how.
It's obviously a simple problem, so if someone could point me right, I would be grateful.
include the QFileDialog
#include <QFileDialog>
then on any method you can write something like this
QString path = QFileDialog::getExistingDirectory (this, tr("Directory"), directory.path());
if ( path.isNull() == false )
{
directory.setPath(path);
}
for more information see this
Related
I created menus and sub menus using the resource editor in visual studio. I now want to add items to one of the menus during run time. I was going to use the InsertMenuItem function but I don't know how to get access to the HMENU variable.
LoadMenu seems is what you need. Use it to load menu from resource editor, something like this:
HMENU yourMenu = LoadMenu( hInst, // variable where you stored your HINSTANCE
MAKEINTRESOURCE(IDM_MENU1) ); // replace IDM_MENU1 with the ID of your menu
Here are lots of useful examples, you may find very useful. Some of them address your issue, and some might be useful to you in the future. I would study the Example of Menu-Item Bitmaps section if I were you...
If you need a menu handle that is already assigned to a window then use GetMenu as member arx said. Something like this:
HMENU yourMenu = GetMenu(hWnd); // hWnd is the HWND of the window that owns your menu
Do not forget to destroy the menu when it is no longer needed ( usually upon window destruction ) with DestroyMenu.
This example might help you as well. This is very good introductory tutorial for Win32, I suggest you to read it ( just go to the home page and download both PDF and .zip file with code examples ).
As I have said before, your question is not entirely clear, so if you have further questions leave me a comment.
Hopefully this answer solved your problems. Best regards.
I have recently been learning how to program with the Clutter GUI toolkit. One thing I haven't been able to figure out is how to set the programs title and icon for the window manager.
As illustrated in the image below, Gnome Shell says that the program name is "Unknown" and that the program does not have an icon.
So, how do I do this?
you cannot do this from Clutter: the windowing system API inside Clutter only allows basic operations.
if you want proper integration in a windowing system you should use Clutter-GTK, and embed a ClutterStage into a Gtk application.
In theory, you can do that in this way:
let stage = Clutter.Stage.get_default ();
let gdkWind = ClutterGdk.get_stage_window (stage);
// The list most containt icons in different sizes.
let list = [GdkPixbuf.Pixbuf.new_from_file("test.png")];
gdkWind.set_icon_list(list);
//The next line not work
gdkWind.set_title("This title is not added");
In practice, you only will can load the icon and the windows title, but not the task bar title for the windows. The set_title won't work as Gdk.Window reference say it will (https://people.gnome.org/~gcampagna/docs/Gdk-3.0/Gdk.Window.set_title.html). Is then a Clutter issue, because is not a GDK "special case". But well is not working.
I want to make a custom message box. What I want to customize is the button's text.
MessageBoxW(
NULL,
L"Target folder already exists. Do you want to overwrite the folder?",
L"No title",
MB_YESNOCANCEL | MB_ICONQUESTION
);
I'd like to just change the buttons text to Overwrite, Skip, Cancel.
What's the most simple way?
I have to make this as having same look and feel with Windows default messagebox.
As said by others, a typical way is to create a dialog resource and have a completely independent dialog, which GUI you need to design in the way that it looks like standard dialog (to meet your request for feel and look). If you want to accept text messages, you might probably need to add code which resizes the window appropriately.
Still, there is another option for those who feel like diving into advanced things. While MessageBox API does not offer much for fint tuning, you still have SetWindowsHookEx in your hands. Having registgered the hook, you can intercept standard MessageBox window procedure and subclass it in the way you like.
Typical things include:
changing button text
adding more controls
adding timed automatic close
Hooking standard window can do all of those.
UPD. Hey, I realized I have some code with SetWindowsHookEx to share: http://alax.info/blog/127
You could create an own dialog. Or you could use a window hook as described in this article.
An archived version of the article can be found on web.archive.com.
Make a dialog resource (with a GUI editor, or by hand) and call DialogBox on it. There's no way to alter MessageBox behaviour, other than what's supported by its arguments.
That said, your message box can very well use stock Yes/No options.
The task dialog functionality introduced in Vista does exactly what you want and follows the prevailing system theme. However, if you have to support XP, then this will be of little comfort to you.
I know this question is old, but I just stumbled upon it now.
I would like to expand the other answers in regards to using a TaskDialog instead of a MessageBox. Here's a concise example of using a TaskDialog to do precisely what was asked; change the button's texts:
const TASKDIALOG_BUTTON buttons[] = { {IDYES, L"Overwrite"}, {IDNO, L"Skip"}, {IDCANCEL, L"Cancel"} };
TASKDIALOGCONFIG taskDialogConfig = {
.cbSize = sizeof(TASKDIALOGCONFIG),
.pszMainIcon = TD_WARNING_ICON, // TaskDialog does not support a question icon; see below
.pButtons = buttons,
.cButtons = ARRAYSIZE(buttons),
.pszWindowTitle = L"No title",
.pszContent = L"Target folder already exists. Do you want to overwrite the folder?"
};
TaskDialogIndirect(&taskDialogConfig, NULL, NULL, NULL);
Some noteworthy things:
You need to use TaskDialogIndirect, not the basic TaskDialog function
when not specifying a parent window, the icon specified in pszMainIcon is displayed in the title bar as well
There is no equivalent to the MessageBox's MB_ICONQUESTION, quoting a quote from this forumpost: Don't use the question mark icon to ask questions. Again, use the question mark icon only for Help entry points. There is no need to ask questions using the question mark icon anyway—it's sufficient to present a main instruction as a question.
checking which button was selected would have to be done by passing a pointer to an int as the second argument of TaskDialogIndirect and checking its value on return (the documentation should be pretty clear)
Here is a small open source library that allows you to customize Message Boxes. Developed by Hans Ditrich.
I have successfully used it in another POC that allows embedding a custom icon in such MessageBox that can be called even from a Console application.
I should also point to the Task Dialog. Here is an example of using it:
int nButtonPressed = 0;
TaskDialog(NULL, hInst,
MAKEINTRESOURCE(IDS_APPLICATION_TITLE),
MAKEINTRESOURCE(IDS_DOSOMETHING),
MAKEINTRESOURCE(IDS_SOMECONTENT),
TDCBF_OK_BUTTON | TDCBF_CANCEL_BUTTON,
TD_WARNING_ICON,
&nButtonPressed);
if (IDOK == nButtonPressed)
{
// OK button pressed
}
else if (IDCANCEL == nButtonPressed)
{
// Cancel pressed
}
I need to create a SDI form with a formview that has two tabs, which encapsulate multiple dialogs as the tab content. But the form has to have a colored background.
And things like these makes me hate programming.
First, I tried CTabControl, via resource editor, tried different things, but the undocumented behavior and the quirks with no answers led me into a roadblock.
After many hours of searching, I found that there is a control called property sheet, which is actually what I need.
Some more searching later, I found that property sheet can even be actually embedded onto CFormView like so: http://www.codeguru.com/Cpp/controls/propertysheet/article.php/c591
And that the dialog classes derived from CPropertyPage can be directly added as pages via AddPage method of CPropertySheet.
Great! Not quite so... Some of the controls didn't worked, and were not created, ran into weird asserts. Turns out the DS_CONTROL style was missing from the dialogs. Found it completely accidentaly on Link, no word about that on MSDN!!!! Property page must have: DS_3DLOOK | DS_CONTROL | WS_CHILD | WS_TABSTOP, and can have: DS_SHELLFONT | DS_LOCALEDIT | WS_CLIPCHILDREN styles! Not any other, which are created by default with resource editor. Sweet, super hidden information for software developers!
The quote in comments on that page: "OMG. That's where that behavior came from...
It turns out that the PlaySound API relied on that behavior when playing sounds on 64bit machines." by Larry Osterman, who as I understand works for Microsoft for 20 years, got me laughing out loud.
Anyway, fixed that, the dialog-controls(CPropertyPages) are created as expected now, and that part looks something remotely promising, but the next part with color is dead end again!
Normally you override WM_CTLCOLOR, check for control ID or hwnd and supply the necessary brush to set the color you need. Not quite so with CPropertySheet, the whole top row stays gray! For CTabCtrl it somehow works, for CPropertySheet it doesn't.
Why? Seems that the CPropertySheet is kinda embedded inside CTabControl or something, because if I override WM_ERASEBKGND, only the internal part changes the color.
Now it seems that there is a GetTabControl() method in the CPropertySheet, that returns the actual CTabCtrl* of the CPropertySheet. But since it's constructed internally, I can't find how to override it's WM_CTLCOLOR message processing.
There seems to be a way to subclass the windowproc, but after multiple tries I can't find any good source on how to do it. SubclassWindow doc on MSDN says: "The window must not already be attached to an MFC object when this function is called."?! What's that?
I tried creating a custom CCustomTabCtrl class based on CTabCtrl via MFC wizard, created an instance of it, called SubclassWindow from one of the CCustomPropertySheet handlers to override the internal CTabCtrl, but nothing works, mystical crashes deep inside MFC.
Tried setting WindowLong with GCL_HBRBACKGROUND for the internal CTabCtrl, nothing changed.
And worst of all, I can't find any sort of useful documentation or tutorials on the topic.
Most I can find is how to ownerdraw the tab control, but this is seriously wrong on so many ways, I want a standard control behavior minus background color, I don't want to support different color schemes, windows versions, IAccesible interfaces and all this stuff, and none of the ownerdraw samples I've seen can get even 10% of all the standard control behavior right. I have no illusion that I will create something better, I wont with the resources at hand.
I stumbled upon this thread, and I can't agree with the author more: http://arstechnica.com/civis/viewtopic.php?f=20&t=169886&sid=aad002424e80121e514548d428cf09c6 owner draw controls are undocumented PITA, that are impossible to do right, and there is NULL information on MSDN to help.
So is there anything I have missed or haven't tried yet? How to change the top strip background color of the CPropertySheet? Anyone?
Your only option is to ownerdraw the tab control. It's not that hard. Well, it is frustrating because MFC doesn't tell you how to make the necessary Win32 calls.
In your CPropertySheet-derived class, overwrite OnInitDialog() and add:
GetTabControl()->ModifyStyle(0,TCS_OWNERDRAWFIXED);
This puts your CPropertySheet-derived class in charge of drawing the tab control. Add a handler for WM_DRAWITEM (OnDrawItem) and change backgroundColor and textColor to match whatever colors you wanted. Code for OnDrawItem follows:
void CPropSht::OnDrawItem(int nIDCtl, LPDRAWITEMSTRUCT lpDrawItemStruct)
{
if (ODT_TAB != lpDrawItemStruct->CtlType)
{
CPropertySheet::OnDrawItem(nIDCtl, lpDrawItemStruct);
return;
}
// prepare to draw the tab control
COLORREF backgroundColor = RGB(0,255,0);
COLORREF textColor = RGB(0,0,255);
CTabCtrl *c_Tab = GetTabControl();
// Get the current tab item text.
TCHAR buffer[256] = {0};
TC_ITEM tcItem;
tcItem.pszText = buffer;
tcItem.cchTextMax = 256;
tcItem.mask = TCIF_TEXT;
if (!c_Tab->GetItem(c_Tab->GetCurSel(), &tcItem )) return;
// draw it
CDC aDC;
aDC.Attach(lpDrawItemStruct->hDC);
int nSavedDC = aDC.SaveDC();
CBrush newBrush;
newBrush.CreateSolidBrush(backgroundColor);
aDC.SelectObject(&newBrush);
aDC.FillRect(&lpDrawItemStruct->rcItem, &newBrush);
aDC.SetBkMode(TRANSPARENT);
aDC.SetTextColor(textColor);
aDC.DrawText(tcItem.pszText, &lpDrawItemStruct->rcItem, DT_CENTER|DT_VCENTER|DT_SINGLELINE);
aDC.RestoreDC(nSavedDC);
aDC.Detach();
}
Thank you for this solution but...
The above solution works well with one tab, but when you have multiple tabs it seems rename the wrong tabs. I needed to change the if statement for GetItem to:
if (!c_Tab->GetItem(lpDrawItemStruct->itemID, &tcItem )) return;
Needed lpDrawItemStruct->itemID to get the tabs named correctly
I am a Qt beginner and working with Qt Designer to develop some small UI elements. I read http://doc.trolltech.com/4.5/designer-using-a-ui-file.html to use these GUI elements in my code and using multiple inheritance approach.
I am introducing bookmark feature which somewhat look like http://img293.imageshack.us/img293/3041/screenshotyb.png. Now the problem I am facing is How can I show all existing bookmark folders in the drop down(say folders are in a QVector). So my main problem is how can I pass some inputs to the UI element.
I think I'm clear, please let me know if further explanation is required. Sorry for adding links directly, rich formatting in my browser is not working.
EDIT :
As some suggested, I have to go via code, but in that case is it possible that create all other components like textEdit, labels, buttons and add combobox using code. Because I have already developed code for bookmarks and adding folder feature in already existing thing.
Thanks For suggestions.
Finally I came up with the solution. I was using multiple inheritance implementation of UI file generated by QT Designer. So solution look like :
Dialog.ui will be UI file generated by QtDesigner
//bookmarDialog.h
#include "ui_Dialog.h"
class BookmarkDialog : public QWidget, private Ui::Dialog
{
Q_OBJECT
public:
BookmarkDialog (QWidget *parent = 0);
}
//bookmarkDialog.cpp
#include "bookmarkDialog.h"
BookmarkDialog::BookmarkDialog()
: QWidget(parent)
{
setupUi(this);
QList folders = getAllFolders();
comboBox->insertItems(0,folders);//comboBox is defined in UI file
}
With Qt Designer, you can add items to a combo box (double-click on the combobox to show up the editor). But if your folder list will vary, you'll have to do it by code.
Have a look to QCombobox documentation (Qt doc is really good).
How are your storing your folders in the vector ? As strings ?
Il your QVector is containing strings, you can easily convert it into a QStringList and use it to populate your combobox :
QVector<QString> FolderList;
myComboBox->addItems(FolderList.toList());
Then, you can connect the signal currentIndexChanged(const QString&) of your QComboBox to a slot to do something when the folder has changed.
I think you have to do it in code. You can fill the combo box in the designer as soon as you are using static values. It is something you are doing dynamically like obtaining the bookmarks folders then you have to do it in your business logic code.
Maybe QtDesigner has been improved since the last time I used and now is possible to do complex things like that, but even in that case, from my experience, I would recommend you not to depend so much of QtDesigner. If you want to do complicated things is faster to do it in code and you will commit less mistakes and will have more control over what you are doing.
You can set the values to the combo box like this:
Suppose the vector contains the folder names as strings and is called folders.
for (int i = 0; i < folders.count(); i++)
{
comboBox.addItem(folders.at(i));
}
If this is not what you are looking for give me a comment and I will try to help.