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The vertical style fails when orientation RIGHT_TO_LEFT is set. I'm using the latest Eclipse Neon version under Ubuntu. Linux openchrom 4.4.0-59-generic #80-Ubuntu SMP Fri Jan 6 17:47:47 UTC 2017 x86_64 x86_64 x86_64 GNU/Linux // Works fine Slider slider = new Slider(composite, SWT.HORIZONTAL); sliderHorizontal.setOrientation(SWT.LEFT_TO_RIGHT); // Works fine Slider slider = new Slider(composite, SWT.HORIZONTAL); sliderHorizontal.setOrientation(SWT.RIGHT_TO_LEFT); // Works fine Slider slider = new Slider(composite, SWT.VERTICAL); sliderHorizontal.setOrientation(SWT.LEFT_TO_RIGHT); // Fails Slider slider = new Slider(composite, SWT.VERTICAL); sliderHorizontal.setOrientation(SWT.RIGHT_TO_LEFT); Who has an idea why it fails?
What does fails exactly means?
When working in horizontal modus, SWT.RIGHT_TO_LEFT works as expected. On the left side is the highest value and on the right side the lowest value. Values are incremented when sliding from RIGHT to LEFT and decremented when sliding from LEFT to RIGHT. So far, so good. When using the slider in SWT.VERTICAL + SWT.RIGHT_TO_LEFT modus, I would assume that the top side represents the highest value and the the bottom side represents the lowest value. Values shall be incremented when sliding from BOTTOM to TOP and decremented when sliding from TOP to BOTTOM then. Instead, setting the orientation in SWT.VERTICAL seems to have no effect at all. I also had a look if there is such constant like SWT.BOTTOM_TO_TOP in SWT, but I didn't find it. Maybe, two new constants could be added to make the functionality better comprehensible: Slider slider = new Slider(composite, SWT.VERTICAL); sliderVertical.setOrientation(SWT.TOP_TO_BOTTOM); // SWT.LEFT_TO_RIGHT and sliderVertical.setOrientation(SWT.BOTTOM_TO_TOP); // SWT.RIGHT_TO_LEFT
Hello, I studied the SWT widgets Slider,Control and Widget over how a slider is constructed and how the orientation is set. More often than not SWT has a difference between HORIZONTAL and VERTICAL style of Slider. For instance, only for Slider set HORIZONTAL, the GTK.gtk_range_set_inverted (handle,boolean) is called. The Control class too sets for both HORIZONTAL and VERTICAL, the GTK.gtk_widget_set_direction( handle, int) with GTK.GTK_TEXT_DIR_RTL or GTK.GTK_TEXT_DIR_LTR as int parameter. I think a good start point could be to investigate GTK.gtk_scrollbar_new (GTK.GTK_ORIENTATION_HORIZONTAL, hAdjustment); I am willing to take this up, but I need 1) Proper GTK documentation, or guide... https://wiki.eclipse.org/SWT/Devel/Gtk/Dev_guide#About_GTK 2) If someone could, then please email himanshubb.eee18@itbhu.ac.in an example each of Slider( both HORIZONTAL and VERTICAL) and a Scrollbar example... The SWT examples are not particularly clear....
Created attachment 282271 [details] Slider vertical
An example of the case can be inspected when using Eclipse SWTChart: https://github.com/eclipse/swtchart Activate the vertical scrollbar, e.g. in LineSeries4: org.eclipse.swtchart.extensions.examples.parts.LineSeries_4_Part IChartSettings chartSettings = getChartSettings(); chartSettings.setVerticalSliderVisible(true); applySettings(chartSettings); Activate to set the scrollbar in ChartSettings: org.eclipse.swtchart.extensions.core.ChartSettings @Override public void setVerticalSliderVisible(boolean verticalSliderVisible) { this.verticalSliderVisible = verticalSliderVisible; } The horizontal slider works fine. The vertical slider moves the chart in the opposite direction. If this slider functionality is intended by the platform, then we would try to handle this inside of Eclipse SWTChart.
Created attachment 282272 [details] Slider horizontal
Could someone tell me if this issue is there on the other two platforms as well? And if it is, weather Just solving it on linux will be sufficient to get the pull request merged into SWT? I shall try for the other two platforms as well otherwise.
