QGridlayout 改变行的高度
我的 QGridLayout 有问题。我的布局的一行包含一个通常隐藏的元素(QProgressbar)。当有一些进展需要报告时,我会打电话进行展示。问题是,当我在 QProgressbar 上调用 show 时,包含它的行上方的行的高度将略有调整(1-3 px)。所以整个布局有点“跳跃”,看起来很难看。
我已经给包含 QProgressbar 的行指定了minimalRowHeight,该行比 QProgressbar 的高度大得多,但行的高度仍然会在 show() 上增加。
我附上了一个演示该问题的程序的最小版本。谁能告诉我那里发生了什么?
标题:
#ifndef MAINWINDOW_H
#define MAINWINDOW_H
#include <QtGui/QMainWindow>
#include <QLineEdit>
#include <QtWebKit/QWebView>
class MainWindow : public QMainWindow
{
Q_OBJECT
public:
MainWindow(QWidget *parent = 0);
private:
QLineEdit* input;
QWebView *webview;
private slots:
void slotLoadButton();
};
#endif // MAINWINDOW_H
来源: #include“mainwindow.h”
#include <QProgressBar>
#include <QPushButton>
#include <QGridLayout>
MainWindow::MainWindow(QWidget *parent)
: QMainWindow(parent)
{
QGridLayout *grid = new QGridLayout;
input = new QLineEdit;
QPushButton *loadButton = new QPushButton("load");
connect(loadButton, SIGNAL(clicked()),
this, SLOT(slotLoadButton()));
webview = new QWebView;
QProgressBar *progress = new QProgressBar;
progress->setFixedHeight(25);
progress->hide();
connect(webview, SIGNAL(loadStarted()),
progress, SLOT(show()));
connect(webview, SIGNAL(loadProgress(int)),
progress, SLOT(setValue(int)));
connect(webview, SIGNAL(loadFinished(bool)),
progress, SLOT(hide()));
grid->addWidget(input, 0, 0);
grid->addWidget(loadButton, 0, 1);
grid->addWidget(webview, 1, 0, 1, -1);
grid->setRowMinimumHeight(2, 35);
grid->addWidget(progress, 2, 1);
QWidget* widget = new QWidget;
widget->setLayout(grid);
setCentralWidget(widget);
}
void MainWindow::slotLoadButton()
{
QUrl url = input->text();
webview->load(url);
}
I have a problem with a QGridLayout. One row of my layout contains an element (QProgressbar) that is normaly hidden. When there is some progress to report i call show on it. The problem is that when i call show on the QProgressbar the row above the row containing it will be slightly resized in height (1-3 px). So the whole layout does a little "jump" which looks ugly.
I have given a minimalRowHeight to the row that contains the QProgressbar that is much larger then the height of the QProgressbar but still the height of the row will increase on show().
I have attached a very minimal version of my program that demonstrates the problem. Can anyone give me a hint what is going on there?
Header:
#ifndef MAINWINDOW_H
#define MAINWINDOW_H
#include <QtGui/QMainWindow>
#include <QLineEdit>
#include <QtWebKit/QWebView>
class MainWindow : public QMainWindow
{
Q_OBJECT
public:
MainWindow(QWidget *parent = 0);
private:
QLineEdit* input;
QWebView *webview;
private slots:
void slotLoadButton();
};
#endif // MAINWINDOW_H
Source:
#include "mainwindow.h"
#include <QProgressBar>
#include <QPushButton>
#include <QGridLayout>
MainWindow::MainWindow(QWidget *parent)
: QMainWindow(parent)
{
QGridLayout *grid = new QGridLayout;
input = new QLineEdit;
QPushButton *loadButton = new QPushButton("load");
connect(loadButton, SIGNAL(clicked()),
this, SLOT(slotLoadButton()));
webview = new QWebView;
QProgressBar *progress = new QProgressBar;
progress->setFixedHeight(25);
progress->hide();
connect(webview, SIGNAL(loadStarted()),
progress, SLOT(show()));
connect(webview, SIGNAL(loadProgress(int)),
progress, SLOT(setValue(int)));
connect(webview, SIGNAL(loadFinished(bool)),
progress, SLOT(hide()));
grid->addWidget(input, 0, 0);
grid->addWidget(loadButton, 0, 1);
grid->addWidget(webview, 1, 0, 1, -1);
grid->setRowMinimumHeight(2, 35);
grid->addWidget(progress, 2, 1);
QWidget* widget = new QWidget;
widget->setLayout(grid);
setCentralWidget(widget);
}
void MainWindow::slotLoadButton()
{
QUrl url = input->text();
webview->load(url);
}
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这可能是由布局的垂直间距和/或边距引起的。您应该尝试使用这些属性。
This is likely caused by the vertical spacing and/or margins of the layout. You should try playing with those properties.
这看起来像是 Qt 中的一个错误。尝试报告
这是一种解决方法:
This looks like a bug in Qt. Try reporting it
This is a workaround: