How can you display text with different colors?

[bask185]

@VRonin said in How can you display text with different colors?:

Before I can move on writing some code examples I'd need to understand what you mean by "screen" are they 5 things side by side or is it a totally different view?

a 'screen' is that big black box with 40 x 16 characters you can see on the screen shots. There are 5 of those, but only 1 can be visually displayed at the time due to the available space. The machine can send an instruction which tells the GUI which of the 5 displays is to be shown, therefor I used the variable index2. In processing code is:

display[index2].paint(); //  0 <= index2 <5

And I indeed have not used any layouts because I am dealing with a fixed resolution, so I did not think I would need the layouts. We simply buy touchmonitors with a 4:3 display ratio and we set our raspberries at 1024 x 768 pixels.

Probably irrelevant:

I want to show [...] characters [...] char lettre
character != char. In 2017 we can't be stuck with ASCII.

Yeah, it kinda is ;) The protocol we are working with works with ASCII characters, nothing I can do about it

[VRonin]

Ok, create 5 QTableWidgets (I'll leave it up to you how you switch from one to the other, QStackedWidget?) and get rid of lettre array.
declare a private QTableWidgets *monitors[] = {ui->tableWidget1, ui->tableWidget2, ui->tableWidget3, ui->tableWidget4, ui->tableWidget5};

then in the constructor add:

for(QTableWidgets* monitor : monitors){
monitor->setRowCount(40);
monitor->setColumnCount(16);
}

now you can use:

• to set the letter content

// char b
monitors[index1]->model()->setData(monitors[index1]->model()->index(column[index1],row[index1]),QChar(b));

• to set the letter colour (here blue)

monitors[index1]->model()->setData(monitors[index1]->model()->index(column[index1],row[index1]),QBrush(Qt::blue),Qt::ForegroundRole);

• to set the background colour for the letter (here blue):

monitors[index1]->model()->setData(monitors[index1]->model()->index(column[index1],row[index1]),QBrush(Qt::blue),Qt::BackgroundRole);

• to reset the colours to the default replace QBrush(...) with QVariant()

[bask185]

@VRonin said in How can you display text with different colors?:

declare a private QTableWidgets *monitors[] = {ui->tableWidget1, ui->tableWidget2, ui->tableWidget3, ui->tableWidget4, ui->tableWidget5};

I am having troubles with this one. I tried both in MainWindow.ccp and in MainWindow.h in the private section looking like this

#ifndef MAINWINDOW_H
#define MAINWINDOW_H

#include <QMainWindow>
#include "keyboard.h"
#include "numpad.h"
#include <QTableWidget>


namespace Ui {
class MainWindow;
}

class MainWindow : public QMainWindow
{
    Q_OBJECT

public:
    explicit MainWindow(QWidget *parent = 0);
    ~MainWindow();

private slots:
    void serialReceived();
    void send(QString c);

    void on_F1_clicked();
   // many more buttons...

private:
    Ui::MainWindow *ui;
    Keyboard *Kboard;
    Numpad *numpad;
    QTableWidget *monitors[] = {ui->tableWidget1, ui->tableWidget2, ui->tableWidget3, ui->tableWidget4, ui->tableWidget5};
};

#endif // MAINWINDOW_H

error message:

C:\Users\sknippels\Documents\GUI\mainwindow.h:64: error: invalid use of incomplete type 'class Ui::MainWindow'
     QTableWidget *monitors[] = {ui->tableWidget1, ui->tableWidget2, ui->tableWidget3, ui->tableWidget4, ui->tableWidget5};
                                   ^

I included the <QTableWidget> library

[VRonin]

You have to get rid of the OpenGL widget and put the widgets somewhere in Qt Designer. the names I used ui->tableWidget1 are just examples, use the names you set in designer

[bask185]

Ok i get it, I only have one small issue left. At first I declared and initialized the array in the constructor. But that gave me the problem that I could not acces it in functions outside the constructor. Than I tried doing it with the rest of the global variables but there it does not reckognize the 'ui' (ui is not declared in this scope). And then I tried declaring the array in the global variables

#include <QTableWidget>

QSerialPort *serial;        // global variables
QTableWidget *monitors[5];

and initialize it in the constructor

monitors[] = {ui->tableWidget_1, ui->tableWidget_2, ui->tableWidget_3, ui->tableWidget_4, ui->tableWidget_5};

   for(QTableWidget* monitor : monitors) {
       monitor->setRowCount(16);
       monitor->setColumnCount(40);
   }

But ofcourse :

C:\Users\sknippels\Documents\GUI\mainwindow.cpp:72: error: expected primary-expression before ']' token
    monitors[] = {ui->tableWidget_1, ui->tableWidget_2, ui->tableWidget_3, ui->tableWidget_4, ui->tableWidget_5};
             ^

so now I lost it -_-"

EDIT:

nvm this fixed it:

 monitors[0] = ui->tableWidget_1;
   monitors[1] = ui->tableWidget_2;
   monitors[2] = ui->tableWidget_3;
   monitors[3] = ui->tableWidget_4;
   monitors[4] = ui->tableWidget_5;

[VRonin]

Do not use global variables unless vital.

move QTableWidget *monitors[5]; in the private section of the class and add monitors({ui->tableWidget1, ui->tableWidget2, ui->tableWidget3, ui->tableWidget4, ui->tableWidget5}) to the constructor initialisation list

[bask185]

The beginning is there.
Now I just have to figure out

• how to make the background black
• remove the grid and everything else I dont need :D

Thank you once again

[VRonin]

@bask185 said in How can you display text with different colors?:

how to make the background black

in designer, select the table and find Style Sheet in the properties, edit it and put background: black

remove the grid and everything else I dont need :D

you can use the loop in the constructor to add:

for(QTableWidgets* monitor : monitors){
monitor->setRowCount(40);
monitor->setColumnCount(16);
monitor->setShowGrid(false);
monitor->horizontalHeader()->hide(); // requires #include <QHeaderView>
monitor->verticalHeader()->hide();
}

you are free to set column and rows sizes as you prefer and you can use other roles to set other parameters. For example Qt::FontRole to adjust the font family, size and style or the Qt::TextAlignmentRole to decide how the text should align in the cell

[bask185]

how can I make the boxes smaller? I found 2 functions which I implemented in the constructor's for-loop but it does not seem to have any effect at all:

monitor->rowHeight(1); // seems it does not matter what number I fill in
monitor->columnWidth(1);

I have read the Qt doc of Qtablewidget 3 times now but I cannot find it. And when I still had the grid I shrank all boxes to absolute mininum size but that was still too lare. I can only fit about 32 characters next to eachother. Is this fixable or should I just use text labels instead?

EDIT:
table->horizontalHeader()->setDefaultSectionSize(20);
table->verticalHeader()->setDefaultSectionSize(20); // Tnx google!

[VRonin]

table->horizontalHeader()->setSectionResizeMode(QHeaderView::Fixed);
table->verticalHeader()->setSectionResizeMode(QHeaderView::Fixed);
table->horizontalHeader()->resizeSections(20);
table->verticalHeader()->resizeSections(20);