I'm writing a C++ wxWidgets calculator application. I want to compress trigonometric function buttons into a single one to save on space, using what's basically a split button. If you left click on it, the current option is used. If you right click, a popup menu is opened, which contains all the buttons; when you click on one of them, it is used and the big button changes.
I've been suggested to use wxComboBox and other stuff for this job, but I preferred using wxPopupTransientWindow because this way I can display the buttons in a grid, making everything - in my opinion - neater.
Problem is, when I choose an option from the menu, the main button's ID changes (because when I reopen the menu the previously clicked button is light up as its ID and the big button's ID match), but the label does not. Furthermore, the popup is supposed to close itself when you left click on one of the buttons, but it does not.
This is the code for the custom button in the popup which is supposed to do all that stuff:
void expandButton::mouseReleased(wxMouseEvent& evt)
{
if (pressed) {
pressed = false;
paintNow();
wxWindow* mBtn = this->GetParent()->GetParent();
mBtn->SetLabel(this->GetLabel());
mBtn->SetId(this->GetId());
this->GetParent()->Close(true);
}
}
This is the code for the custom button in the main frame which opens up the popup (temporary setup just to test if the whole thing is working):
void ikeButton::rightClick(wxMouseEvent& evt) // CREA PANNELLO ESTENSIONE
{
if (flags & EXPANDABLE)
{
std::vector<expandMenuInfo> buttons;
buttons.push_back(expandMenuInfo(L"sin", 3001));
buttons.push_back(expandMenuInfo(L"cos", 3002));
buttons.push_back(expandMenuInfo(L"tan", 3003));
buttons.push_back(expandMenuInfo(L"arcsin", 3004));
buttons.push_back(expandMenuInfo(L"arccos", 3005));
buttons.push_back(expandMenuInfo(L"arctan", 3006));
wxPoint p = this->GetScreenPosition();
size_t sz = this->GetSize().GetHeight() / 1.15;
expandMenu* menu = new expandMenu(this, buttons, sz, wxPoint(
p.x, p.y + this->GetSize().GetHeight() + 2));
menu->SetPosition(wxPoint(
menu->GetPosition().x - ((menu->GetSize().GetWidth() - this->GetSize().GetWidth()) / 2),
menu->GetPosition().y));
menu->Popup();
}
}
Let me know if I need to show more code.
This is probably a terrible way of doing this, but this is basically the first "serious" application I'm creating using the wxWidgets framework. Any help is appreciated.
when I choose an option from the menu, the main button's ID changes
(because when I reopen the menu the previously clicked button is light
up as its ID and the big button's ID match), but the label does not.
If you're creating the popup menu like in your previous post, you had a popup window with a panel as its child and the buttons were then children of the panel layed out with a sizer.
If that's still the case, this->GetParent() and should be the panel, this->GetParent()->GetParent() should be the popup. So this->GetParent()->GetParent()->GetParent() should be the trig function button (assuming you created the popup with the trig function button as the parent).
So I think the line wxWindow* mBtn = this->GetParent()->GetParent(); should be changed to wxWindow* mBtn = this->GetParent()->GetParent()->GetParent();.
Or slightly shorter wxWindow* mBtn = this->GetGrandParent()->GetParent();;
the popup is supposed to close itself when you left click on one of
the buttons, but it does not.
It looks like wxPopupTransientWindow has a special Dismiss method that is supposed to be used to close it.
So I think the line this->GetParent()->Close(true); should be changed to this->GetGrandParent()->Dismiss(); (Assuming as above that the buttons in the popup are children pf a panel).
Alternately, if you want a solution that will work regardless of the parentage of the controls in the popup window, you could have a utility function to find the popup ancestor which would look something like this:
wxPopupTransientWindow* FindPopup(wxWindow* w)
{
wxPopupTransientWindow* popup = NULL;
while ( w != NULL )
{
popup = wxDynamicCast(w, wxPopupTransientWindow);
if ( popup )
{
break;
}
w = w->GetParent();
}
return popup;
}
This uses the wxDynamicCast function which is slightly different from the c++ dynamic_cast expression. wxDynamicCast uses wxWidgets' RTTI system to check if the given pointer can be converted to the given type.
Then the mouseReleased method could use this utility function something like this:
void expandButton::mouseReleased(wxMouseEvent& evt)
{
if (pressed) {
pressed = false;
paintNow();
wxPopupTransientWindow* popup = FindPopup(this);
if (popup ) {
wxWindow* mBtn = popup->GetParent();
mBtn->SetLabel(this->GetLabel());
mBtn->SetId(this->GetId());
mBtn->Refresh();
popup->Dismiss();
}
}
}
I'm not sure why you're setting trig function button to have a new id, but I assume you have a reason.
To make the SetLabel method work in your custom button class, I think the easist thing is to call the SetLabel() method in the button's constructor. This will store the string passed to the constructor in the button's internal label member.
Based on other questions, I think the ikeButton constructor looks something like this:
ikeButton::ikeButton(wxFrame* parent, wxWindowID id, wxString text,...
{
...
this->text = text;
To store the label, you would need to change the line this->text = text; to
SetLabel(text);
And when you draw the button, I think the method you use looks like this:
void ikeButton::render(wxDC& dc)
{
...
dc.DrawText(text, ...);
}
You would need to change, the line dc.DrawText(text, ...); to
dc.DrawText(GetLabel(), ...);
Likewise, any other references to the button's text member should be changed to GetLabel() instead.
Finally, when you set the label in the expandButton::mouseReleased method, it might be a good idea to call button's Refresh() method to force the button to redraw itself. I added that my suggestion for the mouseReleased method above.
I'm trying to make a simple calculator with Embarcadero C++Builder. I'm still a novice. How can I extract text from a button? When I press the button, I want to see "3" on a TEdit field (for example). Surely the event is OnClick. But after that, what must I do to redirect this button to TEdit?
As you said, TButton has an OnClick event; if you want to append a certain character to the text of a TEdit:
// Somewhere declared and istantiated:
//TButton *Button1;
//TEdit *Edit1;
//----------------------------------
void __fastcall TForm1::Button1Click(TObject* Sender)
{
Edit1->Text = Edit1->Text + "3";
}
I am a newcomer in android. Please forgive me if i am asking anything stupid.
I want to show/hide an element (TextView) based on the user input in an EditText element.
Basically there are 3 textview . Based on what is being entered in the edittext, only one of them should be shown ( in this example if mometasone is entered in the edittext, the textview with id strongsteroidtext should be shown and others should hide)
Here is the code pattern that I am using.
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
EditText creamname = (EditText) findViewById(R.id.creamname);
TextView nosteroid = (TextView) findViewById(R.id.nosteroidtext);
TextView weaksteroid = (TextView) findViewById(R.id.weaksteroidtext);
TextView strongsteroid = (TextView) findViewById(R.id.strongsteroidtext);
Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
setSupportActionBar(toolbar);
final String cream = (creamname.getText().toString().trim());
weaksteroidlist = R.string.weaksteroidlist;
{if (cream.equals("beclomethasone")) {
weaksteroid.setVisibility(View.VISIBLE);
nosteroid.setVisibility(View.INVISIBLE);
}
if (cream.equals("mometasone")) {
strongsteroid.setVisibility(View.VISIBLE);
nosteroid.setVisibility(View.INVISIBLE);
} else weaksteroid.setVisibility(View.INVISIBLE);
strongsteroid.setVisibility(View.INVISIBLE);
nosteroid.setVisibility(View.VISIBLE);
}
Now, when I am running this, apparently the "else" statement is only working, which means the "nosteroid" text that is supposed to be visible by this is visible. But when mometasone is being entered, nothing happens ( means the if statement is not working).
What am I getting wrong? please guide me.
OnCreate() method is called only the first time the view is created, not every time the text changes in ur EditText. Study android activity life circle first.
What you want can be achieved by registering ur editText with onKeyListener or onTextChangeListener
And aware this:
else
statement 1;
statement 2;
Is equal to
else {
statement 1;
}
statement 2;
I am developing a cpp/Qt tool.When I click on a QLineEdit field, its frame turns to a different color and the cursor starts blinking.When I type on Return in the field, I want its cursor to stop blinking and its frame color to default back to normal.I can intercept the Return Pressed, but when I then start the clearFocus() command, the keyboard input does not come anymore to the QLineEdit field (which is the behaviour I am expecting), but its frame doesn't go back to the default color and the cursor continues blinking. How to really remove focus from the field (i.e.: No cursor blinking anymore and frame back to default color) ?
=== EDIT ===
Here is the code:
void myQLineEditClass::keyPressEvent(QKeyEvent *e)
{
if(e->text().length()>0)
{
int asciiVal = e->text().at(0).toAscii();
if (asciiVal==3||asciiVal==13)
{
MGlobal::displayInfo(MQtUtil::toMString(QString().sprintf("Focus cleared"))); // -> this is properly displayed
clearFocus();
}
}
QLineEdit::keyPressEvent(e);
}
Thanks.
I have CRichEditCtrl object which is read only(Text is for read and not allowed to modified). I want to provide functionality of Text Selection with Mouse for text displayed with CRichEditCtrl object.
Following Code is working to capture event for Left Mouse Button - DOWN & UP
BOOL CReportFormView::PreTranslateMessage(MSG* pMsg)
{
if (m_EditNs->GetFocus()!=NULL)
{
switch (pMsg->message)
{
case WM_LBUTTONDOWN:
return TRUE;
case WM_LBUTTONUP:
return TRUE;
}
}
}
Now looking for some code to write in case block which will highlight selected text. I want to know if there is any API available for CRichEditCtrl object which help to track at which location user pressed Left Mouse Button and released
You could use member function CString strText = m_myRichEditCtrl.GetSelText(); or some other member function. Like GetSel() just a suggestion.
I think you will need to use the EM_CHARFROMPOS message. ex. some form of this:
POINTL pt { x,y }; // ... screen coordinates to test relative to edit
DWORD info = m_EditNS->SendMessage(EM_CHARFROMPOS, 0, pt);
int charIndex = LOWORD(info);
int line = HIWORD(info);
After that, set the selection with normal selection methods.
https://msdn.microsoft.com/en-us/library/windows/desktop/bb761566(v=vs.85).aspx