line_edit_with_button.cpp
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29 
31 
32 #include <QPushButton>
33 #include <QLineEdit>
34 #include <QHBoxLayout>
35 #include <QKeyEvent>
36 #include <QApplication>
37 
38 namespace rviz
39 {
40 LineEditWithButton::LineEditWithButton(QWidget* parent) : QLineEdit(parent)
41 {
42  button_ = new QPushButton(this);
43  button_->setText("...");
44  button_->setCursor(Qt::ArrowCursor);
45  button_->setDefault(false);
46  button_->setAutoDefault(false);
47  button_->setFocusPolicy(Qt::NoFocus);
48 
49  connect(button_, SIGNAL(clicked()), this, SLOT(onButtonClick()));
50 }
51 
52 void LineEditWithButton::resizeEvent(QResizeEvent* event)
53 {
54  // This widget does not use a QLayout object, because I want the
55  // child button to be sized and positioned a specific way. This
56  // function lays out the child button based on the new size of the
57  // LineEdit.
58 
59  int padding = 1;
60 
61  // Make sure the text area doesn't go under the button.
62  setTextMargins(padding, padding, height(), padding);
63 
64  // Call the original resize handler.
65  QLineEdit::resizeEvent(event);
66 
67  // Make the button square, matching the height of this widget minus
68  // padding, and located all the way to the right.
69  int button_width = height() - 2 * padding;
70  int button_height = button_width;
71  button_->setGeometry(width() - button_width - padding, padding, button_width, button_height);
72 }
73 
75 {
76  // I couldn't find a way to directly tell the editor that I was
77  // done with it here. "Q_EMIT returnPressed()", "Q_EMIT
78  // editingFinished()" etc did nothing. So instead, here I
79  // simulate the user pressing and releasing the "Return" key,
80  // which does indeed make it act like I want: when you select a
81  // topic from the dialog and the dialog closes, the property's
82  // Setter is called and this editor closes.
83  QKeyEvent* event = new QKeyEvent(QEvent::KeyPress, Qt::Key_Return, Qt::NoModifier);
84  QApplication::postEvent(this, event);
85  event = new QKeyEvent(QEvent::KeyRelease, Qt::Key_Return, Qt::NoModifier);
86  QApplication::postEvent(this, event);
87 }
88 
89 } // end namespace rviz
void resizeEvent(QResizeEvent *event) override
void simulateReturnPressed()
Send key events to mimic the "return" key being pressed and released. Useful ending an edit session a...
LineEditWithButton(QWidget *parent=nullptr)
virtual void onButtonClick()
Override this to do something when the button is clicked.


rviz
Author(s): Dave Hershberger, David Gossow, Josh Faust
autogenerated on Mon Aug 15 2022 02:05:16