Example usage for org.eclipse.swt.widgets ScrollBar setVisible

Introduction

In this page you can find the example usage for org.eclipse.swt.widgets ScrollBar setVisible.

Prototype

public void setVisible(boolean visible) 

Source Link

Document

Marks the receiver as visible if the argument is true, and marks it invisible otherwise.

Usage

From source file:org.eclipse.swt.examples.accessibility.CTable.java

void updateVerticalBar() {
    if (drawCount > 0)
        return;//from   w ww .j ava 2 s  . c om
    ScrollBar vBar = getVerticalBar();
    if (vBar == null)
        return;

    int pageSize = (clientArea.height - getHeaderHeight()) / itemHeight;
    int maximum = Math.max(1, itemsCount); /* setting a value of 0 here is ignored */
    if (maximum != vBar.getMaximum()) {
        vBar.setMaximum(maximum);
    }
    int thumb = Math.min(pageSize, maximum);
    if (thumb != vBar.getThumb()) {
        vBar.setThumb(thumb);
        vBar.setPageIncrement(thumb);
    }
    vBar.setVisible(pageSize < maximum);

    /* reclaim any space now left on the bottom */
    if (maximum < topIndex + thumb) {
        topIndex = maximum - thumb;
        vBar.setSelection(topIndex);
        redraw();
    } else {
        int selection = vBar.getSelection();
        if (selection != topIndex) {
            topIndex = selection;
            redraw();
        }
    }
}

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From source file:org.eclipse.swt.examples.accessibility.CTable.java

void onResize(Event event) {
    clientArea = getClientArea();//www  . ja  v  a2s  . c om
    /* vertical scrollbar */
    ScrollBar vBar = getVerticalBar();
    if (vBar != null) {
        int clientHeight = (clientArea.height - getHeaderHeight()) / itemHeight;
        int thumb = Math.min(clientHeight, itemsCount);
        vBar.setThumb(thumb);
        vBar.setPageIncrement(thumb);
        int index = vBar.getSelection();
        if (index != topIndex) {
            topIndex = index;
            redraw();
        }
        boolean visible = clientHeight < itemsCount;
        if (visible != vBar.getVisible()) {
            vBar.setVisible(visible);
            clientArea = getClientArea();
        }
    }

    /* horizontal scrollbar */
    ScrollBar hBar = getHorizontalBar();
    if (hBar != null) {
        int hBarMaximum = hBar.getMaximum();
        int thumb = Math.min(clientArea.width, hBarMaximum);
        hBar.setThumb(thumb);
        hBar.setPageIncrement(thumb);
        horizontalOffset = hBar.getSelection();
        boolean visible = clientArea.width < hBarMaximum;
        if (visible != hBar.getVisible()) {
            hBar.setVisible(visible);
            clientArea = getClientArea();
        }
    }

    /* header */
    int headerHeight = Math.max(fontHeight, headerImageHeight) + 2 * getHeaderPadding();
    header.setSize(clientArea.width, headerHeight);

    /* if this is the focus control but there are no items then the boundary focus ring must be repainted */
    if (itemsCount == 0 && isFocusControl())
        redraw();
}

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From source file:org.eclipse.swt.examples.accessibility.CTable.java

void updateHorizontalBar() {
    if (drawCount > 0)
        return;/*from   ww w . j a  va 2  s . com*/
    ScrollBar hBar = getHorizontalBar();
    if (hBar == null)
        return;

    int maxX = 0;
    if (columns.length > 0) {
        for (CTableColumn column : columns) {
            maxX += column.width;
        }
    } else {
        for (int i = 0; i < itemsCount; i++) {
            Rectangle itemBounds = items[i].getCellBounds(0);
            maxX = Math.max(maxX, itemBounds.x + itemBounds.width + horizontalOffset);
        }
    }

    int clientWidth = clientArea.width;
    if (maxX != hBar.getMaximum()) {
        hBar.setMaximum(Math.max(1, maxX)); /* setting a value of 0 here is ignored */
    }
    int thumb = Math.min(clientWidth, maxX);
    if (thumb != hBar.getThumb()) {
        hBar.setThumb(thumb);
        hBar.setPageIncrement(thumb);
    }
    hBar.setVisible(clientWidth < maxX);

    /* reclaim any space now left on the right */
    if (maxX < horizontalOffset + thumb) {
        horizontalOffset = maxX - thumb;
        hBar.setSelection(horizontalOffset);
        redraw();
    } else {
        int selection = hBar.getSelection();
        if (selection != horizontalOffset) {
            horizontalOffset = selection;
            redraw();
        }
    }
}

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