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Merge pull request #153 from cristian64/address_input_widget
Add memory address input custom widget.
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,86 @@ | ||
| #include "AddressInputWidget.h" | ||
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| #include <QEvent> | ||
| #include <QFontDatabase> | ||
| #include <QPaintEvent> | ||
| #include <QPainter> | ||
| #include <QStyleOptionFrame> | ||
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| namespace | ||
| { | ||
| constexpr int horizontalMargin{2}; // QLineEditPrivate::horizontalMargin | ||
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| class AddressValidator : public QValidator | ||
| { | ||
| public: | ||
| QValidator::State validate(QString& input, int& pos) const override | ||
| { | ||
| if (input.startsWith("0x")) | ||
| { | ||
| input.remove(0, 2); | ||
| pos -= 2; | ||
| } | ||
| if (input.size() > 8) | ||
| { | ||
| return QValidator::Invalid; | ||
| } | ||
| return QValidator::Acceptable; | ||
| } | ||
| }; | ||
| } // namespace | ||
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| AddressInputWidget::AddressInputWidget(QWidget* const parent) : QLineEdit(parent) | ||
| { | ||
| setPlaceholderText("00000000"); | ||
| setValidator(new AddressValidator); | ||
| setMaxLength(10); // 8 + 2, to allow the user to paste a value that includes the "0x" prefix | ||
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| const QFont fixedFont{QFontDatabase::systemFont(QFontDatabase::SystemFont::FixedFont)}; | ||
| setFont(fixedFont); | ||
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| updateStyleSheet(); | ||
| } | ||
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| bool AddressInputWidget::event(QEvent* const event) | ||
| { | ||
| if (event->type() == QEvent::FontChange) | ||
| { | ||
| updateStyleSheet(); | ||
| } | ||
| return QLineEdit::event(event); | ||
| } | ||
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| void AddressInputWidget::paintEvent(QPaintEvent* const event) | ||
| { | ||
| QLineEdit::paintEvent(event); | ||
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| const QColor placeholderTextColor{palette().color(QPalette::PlaceholderText)}; | ||
| const QColor textColor{palette().color(QPalette::Text)}; | ||
| const QColor prefixColor{ | ||
| (placeholderTextColor.red() + textColor.red()) / 2, | ||
| (placeholderTextColor.green() + textColor.green()) / 2, | ||
| (placeholderTextColor.blue() + textColor.blue()) / 2, | ||
| }; | ||
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| QStyleOptionFrame panel{}; | ||
| initStyleOption(&panel); | ||
| const QRect contentsRect{style()->subElementRect(QStyle::SE_LineEditContents, &panel, this)}; | ||
| const int x{contentsRect.x() + horizontalMargin - AddressInputWidget::calcPrefixWidth()}; | ||
| const int y{(rect().height() + fontMetrics().tightBoundingRect("0x").height()) / 2}; | ||
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| QPainter painter(this); | ||
| painter.setPen(prefixColor); | ||
| painter.setFont(font()); | ||
| painter.drawText(x, y, "0x"); | ||
| } | ||
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| int AddressInputWidget::calcPrefixWidth() | ||
| { | ||
| return fontMetrics().horizontalAdvance("0x"); | ||
| } | ||
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| void AddressInputWidget::updateStyleSheet() | ||
| { | ||
| setStyleSheet(QStringLiteral("QLineEdit { padding-left: %1px }") | ||
| .arg(AddressInputWidget::calcPrefixWidth())); | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,22 @@ | ||
| #pragma once | ||
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| #include <QLineEdit> | ||
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| class AddressInputWidget final : public QLineEdit | ||
| { | ||
| public: | ||
| explicit AddressInputWidget(QWidget* parent = nullptr); | ||
| ~AddressInputWidget() override = default; | ||
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| AddressInputWidget(const AddressInputWidget&) = delete; | ||
| AddressInputWidget(AddressInputWidget&&) = delete; | ||
| AddressInputWidget& operator=(const AddressInputWidget&) = delete; | ||
| AddressInputWidget& operator=(AddressInputWidget&&) = delete; | ||
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| bool event(QEvent* event) override; | ||
| void paintEvent(QPaintEvent* event) override; | ||
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| private: | ||
| int calcPrefixWidth(); | ||
| void updateStyleSheet(); | ||
| }; |
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