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Add placeholder text support

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This commit is contained in:
WarmUpTill 2026-04-02 13:55:51 +02:00
parent 7e2ef9aacc
commit 81987074b3
2 changed files with 53 additions and 1 deletions
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47
lib/utils/list-editor.cpp
View File

@ -1,13 +1,16 @@
#include "list-editor.hpp"
#include "ui-helpers.hpp"
#include <QEvent>
namespace advss {
ListEditor::ListEditor(QWidget *parent, bool reorder)
: QWidget(parent),
_list(new QListWidget()),
_controls(new ListControls(this, reorder)),
_mainLayout(new QVBoxLayout())
_mainLayout(new QVBoxLayout()),
_placeholder(new QLabel(_list->viewport()))
{
QWidget::connect(_controls, SIGNAL(Add()), this, SLOT(Add()));
QWidget::connect(_controls, SIGNAL(Remove()), this, SLOT(Remove()));
@ -15,6 +18,19 @@ ListEditor::ListEditor(QWidget *parent, bool reorder)
QWidget::connect(_controls, SIGNAL(Down()), this, SLOT(Down()));
QWidget::connect(_list, SIGNAL(itemDoubleClicked(QListWidgetItem *)),
this, SLOT(Clicked(QListWidgetItem *)));
QWidget::connect(_list->model(),
SIGNAL(rowsInserted(QModelIndex, int, int)), this,
SLOT(UpdatePlaceholder()));
QWidget::connect(_list->model(),
SIGNAL(rowsRemoved(QModelIndex, int, int)), this,
SLOT(UpdatePlaceholder()));
QWidget::connect(_list->model(), SIGNAL(modelReset()), this,
SLOT(UpdatePlaceholder()));
_placeholder->setAlignment(Qt::AlignCenter);
_placeholder->setWordWrap(true);
_placeholder->hide();
_list->viewport()->installEventFilter(this);
_mainLayout->setContentsMargins(0, 0, 0, 0);
_mainLayout->addWidget(_list);
@ -22,6 +38,30 @@ ListEditor::ListEditor(QWidget *parent, bool reorder)
setLayout(_mainLayout);
}
void ListEditor::SetPlaceholderText(const QString &text)
{
_placeholder->setText(text);
UpdatePlaceholder();
}
void ListEditor::UpdatePlaceholder()
{
bool visible = !_placeholder->text().isEmpty() && _list->count() == 0;
_placeholder->setVisible(visible);
if (visible) {
_placeholder->setGeometry(_list->viewport()->rect());
}
}
bool ListEditor::eventFilter(QObject *obj, QEvent *event)
{
if (obj == _list->viewport() && event->type() == QEvent::Resize &&
_placeholder->isVisible()) {
_placeholder->setGeometry(_list->viewport()->rect());
}
return QWidget::eventFilter(obj, event);
}
void ListEditor::showEvent(QShowEvent *e)
{
QWidget::showEvent(e);
@ -64,6 +104,11 @@ int ListEditor::GetIndexOfSignal() const
void ListEditor::UpdateListSize()
{
SetHeightToContentHeight(_list);
if (_list->count() == 0 && !_placeholder->text().isEmpty()) {
auto height = _list->fontMetrics().height() * 3;
_list->setMinimumHeight(height);
_list->setMaximumHeight(height);
}
adjustSize();
updateGeometry();
}

7
lib/utils/list-editor.hpp
View File

@ -2,6 +2,7 @@
#include "export-symbol-helper.hpp"
#include "list-controls.hpp"
#include <QLabel>
#include <QListWidget>
#include <QLayout>
@ -13,9 +14,11 @@ class ADVSS_EXPORT ListEditor : public QWidget {
public:
ListEditor(QWidget *parent = nullptr, bool reorder = true);
int count() const { return _list->count(); };
void SetPlaceholderText(const QString &text);
protected:
void showEvent(QShowEvent *);
bool eventFilter(QObject *, QEvent *);
private slots:
virtual void Add() = 0;
@ -23,6 +26,7 @@ private slots:
virtual void Up(){};
virtual void Down(){};
virtual void Clicked(QListWidgetItem *) {}
void UpdatePlaceholder();
protected:
void UpdateListSize();
@ -31,6 +35,9 @@ protected:
QListWidget *_list;
ListControls *_controls;
QVBoxLayout *_mainLayout;
private:
QLabel *_placeholder;
};
} // namespace advss