mirror of
https://github.com/qgis/QGIS.git
synced 2025-02-26 00:02:08 -05:00
c49b5b777f
Rationale: - there was a lot of large objects passed by value, so potentially there's a speed bump from this - even for implicitly shared classes like QString/QList there's still a (small) cost for copying the objects when there's no reason to - it's the right thing to do!
52 lines
1.6 KiB
Plaintext
52 lines
1.6 KiB
Plaintext
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/** A combobox which lets the user select map scale from predefined list
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* and highlights nearest to current scale value
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*/
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class QgsScaleWidget : QWidget
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{
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%TypeHeaderCode
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#include <qgsscalewidget.h>
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%End
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public:
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QgsScaleWidget( QWidget* parent /TransferThis/ = 0 );
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~QgsScaleWidget();
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//! shows a button to set the scale to the current scale of the map canvas next to the combobox
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//! @note the map canvas must be defined to show the button
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void setShowCurrentScaleButton( bool showCurrentScaleButton );
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bool showCurrentScaleButton();
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//! set the map canvas associated to the current button
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void setMapCanvas( QgsMapCanvas* canvas );
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//! Function to read the selected scale as text
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QString scaleString();
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//! Function to set the selected scale from text
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bool setScaleString( const QString& scaleTxt );
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//! Function to read the selected scale as double
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double scale();
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//! Function to set the selected scale from double
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void setScale( double scale );
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//! Helper function to convert a double to scale string
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// Performs rounding, so an exact representation is not to
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// be expected.
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static QString toString( double scale );
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//! Helper function to convert a scale string to double
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static double toDouble( const QString& scaleString, bool *ok = 0 );
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public slots:
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void updateScales( const QStringList &scales = QStringList() );
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//! assign the current scale from the map canvas
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void setScaleFromCanvas();
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signals:
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//! Signal is emitted when *user* has finished editing/selecting a new scale.
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void scaleChanged();
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};
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