KoZoomMode Class Reference

#include <KoZoomMode.h>

Public Types
enum	Mode { ZOOM_CONSTANT = 0 , ZOOM_PAGE = 1 , ZOOM_WIDTH = 2 , ZOOM_HEIGHT = 16 }

Static Public Member Functions
static qreal	findNextZoom (qreal currentZoom, const QVector< qreal > &zoomLevels)
static qreal	findPrevZoom (qreal currentZoom, const QVector< qreal > &zoomLevels)
static QVector< qreal >	generateStandardZoomLevels (qreal minZoom, qreal maxZoom)
static QString	toString (Mode mode)

Static Private Attributes
static const char *const	modes []

Detailed Description

The ZoomMode container

Definition at line 19 of file KoZoomMode.h.

Member Enumeration Documentation

Mode

enum KoZoomMode::Mode

Enumerator
ZOOM_CONSTANT	zoom x %
ZOOM_PAGE	zoom page
ZOOM_WIDTH	zoom pagewidth
ZOOM_HEIGHT	zoom pageheight

Definition at line 22 of file KoZoomMode.h.

    {
        ZOOM_CONSTANT = 0,  
        ZOOM_PAGE     = 1,  
        ZOOM_WIDTH    = 2,  
        ZOOM_HEIGHT   = 16,  
    };

Member Function Documentation

findNextZoom()

qreal KoZoomMode::findNextZoom ( qreal currentZoom, const QVector< qreal > & zoomLevels )

static

Find the next zoom level to switch during the zoom-in operation

Definition at line 63 of file KoZoomMode.cpp.

{
    const qreal eps = 1e-5;
    int i = 0;
    while (i < zoomLevels.size() - 1 && currentZoom > zoomLevels[i] - eps) {
        i++;
    }
 
    return qMax(currentZoom, zoomLevels[i]);
}

References eps.

findPrevZoom()

qreal KoZoomMode::findPrevZoom ( qreal currentZoom, const QVector< qreal > & zoomLevels )

static

Find the previous zoom level to switch during the zoom-out operation

Definition at line 74 of file KoZoomMode.cpp.

{
    const qreal eps = 1e-5;
    int i = zoomLevels.size() - 1;
    while (i > 0 && currentZoom < zoomLevels[i] + eps) i--;
 
    return qMin(currentZoom, zoomLevels[i]);
}

References eps.

generateStandardZoomLevels()

QVector< qreal > KoZoomMode::generateStandardZoomLevels ( qreal minZoom, qreal maxZoom )

static

Generates standard zoom levels for the allowed range of minZoom and maxZoom

Definition at line 34 of file KoZoomMode.cpp.

{
    KConfigGroup config = KSharedConfig::openConfig()->group("");
    int steps = config.readEntry("zoomSteps", 2);
    qreal k = steps / M_LN2;
 
    int first =  ceil(log(minZoom) * k);
    int size  = floor(log(maxZoom) * k) - first + 1;
    QVector<qreal> zoomLevels(size);
 
    // enforce zoom levels relating to thirds (33.33%, 66.67%, ...)
    QVector<qreal> snap(steps);
    if (steps > 1) {
        qreal third = log(4./ 3.) * k;
        int i = round(third);
        snap[(i - first) % steps] = third - i;
    }
 
    k = 1./ k;
    for (int i = 0; i < steps; i++) {
        qreal f = exp((i + first + snap[i]) * k);
        f = floor(f * 0x1p48 + 0.5) / 0x1p48; // round off inaccuracies
        for (int j = i; j < size; j += steps, f *= 2.) {
            zoomLevels[j] = f;
        }
    }
    return zoomLevels;
}

toString()

QString KoZoomMode::toString ( Mode mode )

static

Returns

the to QString converted and translated Mode mode

Definition at line 19 of file KoZoomMode.cpp.

{
    switch (mode) {
    case KoZoomMode::ZOOM_CONSTANT:
        KIS_SAFE_ASSERT_RECOVER_RETURN_VALUE(0 && "constant zoom has no user-friendly representation", "XXX");
    case KoZoomMode::ZOOM_PAGE:
        return i18n("Fit View");
    case KoZoomMode::ZOOM_WIDTH:
        return i18n("Fit Width");
    case KoZoomMode::ZOOM_HEIGHT:
        return i18n("Fit Height");
    }
    return "";
}

References KIS_SAFE_ASSERT_RECOVER_RETURN_VALUE, ZOOM_CONSTANT, ZOOM_HEIGHT, ZOOM_PAGE, and ZOOM_WIDTH.

Member Data Documentation

modes

const char* const KoZoomMode::modes[]

staticprivate

Definition at line 52 of file KoZoomMode.h.

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

• libs/flake/KoZoomMode.h
• libs/flake/KoZoomMode.cpp