ClickableImageLabel Class Reference

The ClickableImageLabel class Displays an image scaled to fit a reasonable dialog size, but always samples the picked color from the original, full-resolution image at the corresponding coordinate – never from the (possibly smoothly interpolated, and therefore color-blended) scaled-down pixmap being displayed, which would make the picked color subtly wrong for exactly the pixels near an edge where it matters most. More...

#include <imagetransparentcolordialog.h>

Inherits QLabel.

Collaboration diagram for ClickableImageLabel:

Signals
void	colorPicked (const QColor &color)

Public Member Functions
	ClickableImageLabel (const QImage &sourceImage, QWidget *parent=nullptr)
	ClickableImageLabel::ClickableImageLabel.
QImage	displayImage () const

Protected Member Functions
void	mousePressEvent (QMouseEvent *event) override
	ClickableImageLabel::mousePressEvent Maps the click back to the original, full-resolution image before sampling – see the class-level comment for why.

Private Attributes
QImage	m_source
QImage	m_displayImage
qreal	m_displayScale = 1.0

Detailed Description

The ClickableImageLabel class Displays an image scaled to fit a reasonable dialog size, but always samples the picked color from the original, full-resolution image at the corresponding coordinate – never from the (possibly smoothly interpolated, and therefore color-blended) scaled-down pixmap being displayed, which would make the picked color subtly wrong for exactly the pixels near an edge where it matters most.

Constructor & Destructor Documentation

ClickableImageLabel()

ClickableImageLabel::ClickableImageLabel ( const QImage & sourceImage, QWidget * parent = nullptr )

explicit

ClickableImageLabel::ClickableImageLabel.

Parameters

sourceImage	the full-resolution image to display and sample from
parent

Member Function Documentation

colorPicked

void ClickableImageLabel::colorPicked ( const QColor & color )

signal

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displayImage()

QImage ClickableImageLabel::displayImage ( ) const

inline

The same downsampled image already computed for display – reused as the live-preview source so a tolerance drag runs its per-tick colour-key pass against a small image instead of the full-resolution one, which on a large source (a scanned schematic background, several Mpx) made every intermediate slider tick visibly lag. resultPixmap() still computes the final, committed result from the true full-resolution source – only the live preview is downsampled.

mousePressEvent()

void ClickableImageLabel::mousePressEvent ( QMouseEvent * event )

overrideprotected

ClickableImageLabel::mousePressEvent Maps the click back to the original, full-resolution image before sampling – see the class-level comment for why.

Parameters

event

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Member Data Documentation

m_displayImage

QImage ClickableImageLabel::m_displayImage

private

m_displayScale

qreal ClickableImageLabel::m_displayScale = 1.0

private

m_source

QImage ClickableImageLabel::m_source

private

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The documentation for this class was generated from the following files:

• sources/ui/imagetransparentcolordialog.h
• sources/ui/imagetransparentcolordialog.cpp