Qt设计器--设置样式表--现在硬编码--想要以编程方式设置
Qt设计器--设置样式表--现在硬编码--想要以编程方式设置
提问于 2016-12-13 04:52:39
我正在使用Qt designer创建一组32个状态的“灯光”。我的灯是QLabels的。因此，将我的空白Qlabel初始化为一个黄色样式表，然后根据布尔数据的文本文件输入将每个光设置为红色或绿色。我的问题是，每次我必须硬编码它，因为设计器语法是ui->color_0->setStyleSheet("background-color: rgb(0,255，0);")；
color_0、color_1等都是QLabel对象。我想写一个for循环，并将循环增量连接(附加)到颜色，但这不起作用，因为它不是QLabel类型。下面的代码，让我知道你将如何清理这段代码，使它更有效率。
void static2::on_pushButtonNext_clicked()
{
if (incrementer == 0)
{
int tot_size = text.size();
const char *str;
QByteArray array; //http://www.qtcentre.org/threads/22711-Converting-QString-to-char-array
array = text.toLatin1();
str = array.data();
}
//write an if statement here that prevents from running past the total stream. run if less than num_events_dec to end.
if (incrementer*num_events_dec <= tot_size - num_events_dec)
{
incrementer++;
ui->lcdNumber->display(incrementer); //updates display
int step = (incrementer-1)*num_events_dec; //this is the code that goes bit by bit on the stream
for (int i = step; i < step+num_events_dec; i++){
//PLACE COLOR SETTING COMMANDS HERE
//http://stackoverflow.com/questions/2749798/qlabel-set-color-of-text-and-background
//http://www.qtcentre.org/archive/index.php/t-5944.html
if (str[i] == '1'){
//make label background green
//qDebug() << "high";
//QLabel* color = new QLabel; //[num_events_dec]; //allocates an array of objects called color which is of the user specified size
/*QString color = "color_" + QString::number(i);
qDebug() << i;
qDebug() << color;
*/
/* As of right now i have string values that are of the proper name
* I need those same names as Qlabels in order for ui->xxx to recognize them
* The class mainwindow has an object ui which has an object called color_[i]
*/
//ui->color->setStyleSheet("background-color: rgb(0, 255, 0);");
switch (i-step){
case 0: ui->color_0->setStyleSheet("background-color: rgb(0, 255, 0);"); break;
case 1: ui->color_1->setStyleSheet("background-color: rgb(0, 255, 0);"); break;
case 2: ui->color_2->setStyleSheet("background-color: rgb(0, 255, 0);"); break;
case 3: ui->color_3->setStyleSheet("background-color: rgb(0, 255, 0);"); break;
case 4: ui->color_4->setStyleSheet("background-color: rgb(0, 255, 0);"); break;
case 5: ui->color_5->setStyleSheet("background-color: rgb(0, 255, 0);"); break;
case 6: ui->color_6->setStyleSheet("background-color: rgb(0, 255, 0);"); break;
case 7: ui->color_7->setStyleSheet("background-color: rgb(0, 255, 0);"); break;
case 8: ui->color_8->setStyleSheet("background-color: rgb(0, 255, 0);"); break;
case 9: ui->color_9->setStyleSheet("background-color: rgb(0, 255, 0);"); break;
case 10: ui->color_10->setStyleSheet("background-color: rgb(0, 255, 0);"); break;
case 11: ui->color_11->setStyleSheet("background-color: rgb(0, 255, 0);"); break;
case 12: ui->color_12->setStyleSheet("background-color: rgb(0, 255, 0);"); break;
case 13: ui->color_13->setStyleSheet("background-color: rgb(0, 255, 0);"); break;
case 14: ui->color_14->setStyleSheet("background-color: rgb(0, 255, 0);"); break;
case 15: ui->color_15->setStyleSheet("background-color: rgb(0, 255, 0);"); break;
case 16: ui->color_16->setStyleSheet("background-color: rgb(0, 255, 0);"); break;
case 17: ui->color_17->setStyleSheet("background-color: rgb(0, 255, 0);"); break;
case 18: ui->color_18->setStyleSheet("background-color: rgb(0, 255, 0);"); break;
case 19: ui->color_19->setStyleSheet("background-color: rgb(0, 255, 0);"); break;
case 20: ui->color_20->setStyleSheet("background-color: rgb(0, 255, 0);"); break;
case 21: ui->color_21->setStyleSheet("background-color: rgb(0, 255, 0);"); break;
case 22: ui->color_22->setStyleSheet("background-color: rgb(0, 255, 0);"); break;
case 23: ui->color_23->setStyleSheet("background-color: rgb(0, 255, 0);"); break;
case 24: ui->color_24->setStyleSheet("background-color: rgb(0, 255, 0);"); break;
case 25: ui->color_25->setStyleSheet("background-color: rgb(0, 255, 0);"); break;
case 26: ui->color_26->setStyleSheet("background-color: rgb(0, 255, 0);"); break;
case 27: ui->color_27->setStyleSheet("background-color: rgb(0, 255, 0);"); break;
case 28: ui->color_28->setStyleSheet("background-color: rgb(0, 255, 0);"); break;
case 29: ui->color_29->setStyleSheet("background-color: rgb(0, 255, 0);"); break;
case 30: ui->color_30->setStyleSheet("background-color: rgb(0, 255, 0);"); break;
case 31: ui->color_31->setStyleSheet("background-color: rgb(0, 255, 0);"); break;
} //end switch case
} //end if
else if (str[i] == '0'){
//make label background red
//qDebug() << "low";
switch (i-step){
case 0: ui->color_0->setStyleSheet("background-color: rgb(255, 0, 0);"); break;
case 1: ui->color_1->setStyleSheet("background-color: rgb(255, 0, 0);"); break;
case 2: ui->color_2->setStyleSheet("background-color: rgb(255, 0, 0);"); break;
case 3: ui->color_3->setStyleSheet("background-color: rgb(255, 0, 0);"); break;
case 4: ui->color_4->setStyleSheet("background-color: rgb(255, 0, 0);"); break;
case 5: ui->color_5->setStyleSheet("background-color: rgb(255, 0, 0);"); break;
case 6: ui->color_6->setStyleSheet("background-color: rgb(255, 0, 0);"); break;
case 7: ui->color_7->setStyleSheet("background-color: rgb(255, 0, 0);"); break;
case 8: ui->color_8->setStyleSheet("background-color: rgb(255, 0, 0);"); break;
case 9: ui->color_9->setStyleSheet("background-color: rgb(255, 0, 0);"); break;
case 10: ui->color_10->setStyleSheet("background-color: rgb(255, 0, 0);"); break;
case 11: ui->color_11->setStyleSheet("background-color: rgb(255, 0, 0);"); break;
case 12: ui->color_12->setStyleSheet("background-color: rgb(255, 0, 0);"); break;
case 13: ui->color_13->setStyleSheet("background-color: rgb(255, 0, 0);"); break;
case 14: ui->color_14->setStyleSheet("background-color: rgb(255, 0, 0);"); break;
case 15: ui->color_15->setStyleSheet("background-color: rgb(255, 0, 0);"); break;
case 16: ui->color_16->setStyleSheet("background-color: rgb(255, 0, 0);"); break;
case 17: ui->color_17->setStyleSheet("background-color: rgb(255, 0, 0);"); break;
case 18: ui->color_18->setStyleSheet("background-color: rgb(255, 0, 0);"); break;
case 19: ui->color_19->setStyleSheet("background-color: rgb(255, 0, 0);"); break;
case 20: ui->color_20->setStyleSheet("background-color: rgb(255, 0, 0);"); break;
case 21: ui->color_21->setStyleSheet("background-color: rgb(255, 0, 0);"); break;
case 22: ui->color_22->setStyleSheet("background-color: rgb(255, 0, 0);"); break;
case 23: ui->color_23->setStyleSheet("background-color: rgb(255, 0, 0);"); break;
case 24: ui->color_24->setStyleSheet("background-color: rgb(255, 0, 0);"); break;
case 25: ui->color_25->setStyleSheet("background-color: rgb(255, 0, 0);"); break;
case 26: ui->color_26->setStyleSheet("background-color: rgb(255, 0, 0);"); break;
case 27: ui->color_27->setStyleSheet("background-color: rgb(255, 0, 0);"); break;
case 28: ui->color_28->setStyleSheet("background-color: rgb(255, 0, 0);"); break;
case 29: ui->color_29->setStyleSheet("background-color: rgb(255, 0, 0);"); break;
case 30: ui->color_30->setStyleSheet("background-color: rgb(255, 0, 0);"); break;
case 31: ui->color_31->setStyleSheet("background-color: rgb(255, 0, 0);"); break;
} //end switch case
} //end else if
else {
QMessageBox::warning(this,"Error", "A non-binary number has been read -- Check input stream");
} //end else
} //end for loop
} //end if
else //dont allow to increment
{
QMessageBox::warning(this,"Error", "Stream Ended, No more data to view");
} //end else}//结束按钮点击
回答 3
Stack Overflow用户
发布于 2016-12-13 05:14:56
您可以将标签的背景设置为调色板角色，然后通过调色板轻松操作它。例如，在每个标签上设置以下样式表：
"background-color: window"然后，您可以通过调色板设置标签的背景色：
void MyWidget::setColor(QWidget *w, const QColor &c) {
pal = w->palette();
pal.setBrush(QPalette::Window, {c});
w->setPalette(pal);
}您还可以按名称查找子小部件，从而避免显式访问ui成员的字段的重复代码：
QWidget *MyWidget::getColor(int n) {
return qobject_cast<QWidget*>(findChild(QStringLiteral("color_%1").arg(n)));
}因此，您的两个大开关简化为：
void MyWidget::setColorState(int n, QChar c) {
auto widget = getColor(n);
if (!widget) return;
setColor(widget, c == QLatin1Char('1') ? Qt::green :
c == QLatin1Char('0') ? Qt::red :
Qt::black);
}然后，要从二进制字符串中获取这些字符串：
void MyWidget::setColors(const QString &str) {
int i = 0;
for (i < str.length() && i < 32; ++i) {
if (str[i] != QLatin1Char('1') && str[i] != QLatin1Char('0'))
qWarning() << "str contains non-binary digit:" << str;
setColorState(i, str[i]);
}
for (i < 32; ++i)
setColorState(i, ' ');
}你不应该通过消息向用户报告代码中的逻辑错误。请改用qWarning()。
您也不必将字符串从QString转换为QByteArray。这毫无意义。
Stack Overflow用户
发布于 2016-12-13 05:28:10
如果你愿意，你也可以有一个哈希表。如果您想使用样式表而不是kubas answer，下面是一个示例。
#ifndef MAINWINDOW_H
#define MAINWINDOW_H
#include <QMainWindow>
#include <QLabel>
namespace Ui {
class MainWindow;
}
class MainWindow : public QMainWindow
{
Q_OBJECT
public:
explicit MainWindow(QWidget *parent = 0);
~MainWindow();
void customize(QLabel* label,QString color);
private slots:
void on_pushButton_clicked();
void on_pushButton_2_clicked();
private:
Ui::MainWindow *ui;
QHash<int,QLabel*> hash;
};
#endif // MAINWINDOW_H
#include "mainwindow.h"
#include "ui_mainwindow.h"
MainWindow::MainWindow(QWidget *parent) :
QMainWindow(parent),
ui(new Ui::MainWindow)
{
ui->setupUi(this);
hash[1] = ui->label_1;
hash[2] = ui->label_2;
hash[3] = ui->label_3;
}
MainWindow::~MainWindow()
{
delete ui;
}
void MainWindow::customize(QLabel *label, QString color)
{
QString colorstring("background-color:");
colorstring.append(color);
colorstring.append(";");
label->setStyleSheet(colorstring);
}
void MainWindow::on_pushButton_clicked()
{
QString color("rgb(255,0,0)");
customize(hash[1],color);
}
void MainWindow::on_pushButton_2_clicked()
{
QString color("rgb(0,255,0)");
customize(hash[1],color);
}Stack Overflow用户
发布于 2016-12-14 02:54:22
最简单的方法可能是在包含的小部件上设置一个样式表，然后使用动态属性来打开或关闭每个小部件，如下所示：
#include <QApplication>
#include <QBoxLayout>
#include <QLabel>
#include <QSpinBox>
#include <QStyle>
#include <QWidget>
#include <array>
class BinaryIndicator : public QWidget
{
Q_OBJECT
Q_DISABLE_COPY(BinaryIndicator)
std::array<QLabel*, 32> labels;
public:
BinaryIndicator(QWidget *parent = nullptr)
: QWidget(parent)
{
setStyleSheet("QLabel[state='on'] { background-color: red; }"
"QLabel[state='off'] { background-color: green; }");
auto layout = new QHBoxLayout();
for (auto& l: labels) {
l = new QLabel(this);
layout->addWidget(l);
}
setLayout(layout);
setValue(0);
}
public slots:
void setValue(uint32_t value)
{
int i = 32;
for (auto *label: labels) {
label->setProperty("state", value & 1<<--i ? "on" : "off");
// we need to re-polish the widget to pick up the changed
// style selector
label->style()->unpolish(label);
label->style()->polish(label);
}
}
};
int main(int argc, char **argv)
{
QApplication app(argc, argv);
QWidget w;
auto layout = new QVBoxLayout();
w.setLayout(layout);
auto indicator = new BinaryIndicator(&w);
layout->addWidget(indicator);
auto spinbox = new QSpinBox(&w);
spinbox->setRange(0, 0x7fffffff);
layout->addWidget(spinbox);
QObject::connect<void(QSpinBox::*)(int)>(spinbox, &QSpinBox::valueChanged, indicator, &BinaryIndicator::setValue);
w.show();
app.exec();
}
#include "41109349_moc.cpp"请注意，我们必须重新打磨小部件，使其与属性的新值相匹配-请参阅changing stylesheet dynamically。此外，QSpinBox仅限于带符号的32位值。
页面原文内容由Stack Overflow提供。腾讯云小微IT领域专用引擎提供翻译支持
原文链接：
https://stackoverflow.com/questions/41109349
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