[solved] How to get OnClick event for TTitleFootClickTool
lazarus / 55-TAChart

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Muso · 2021-04-17 03:02

I need the new features TTitleFootClickTool and TLegendClickTool. So I
got the latest Laz 2.1 via fcupdeluxe.

In my chart I have set the TChartToolset which contains
TTitleFootClickTool . But when I click at runtime at the title of the
chart, the OnClick event is not triggered. The same is for the legend.
To test I added to the TChartToolset a data crosshair tool and there
e.g. the OnDraw event is correctly triggered.

As next test I added a DataPointClickTool. But there the OnPointClick
is also not triggered on clicking on a data point on the chart.

Therefore I am a bit lost. Do I have to do something special to
trigger the click events?

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wp · 2021-04-17 12:26

There is a charteditor demo in folder
components/tachart/demo/charteditor of the trunk TAChart installation;
it excessively uses the new chart tools.
https://wiki.lazarus.freepascal.org/TAChart_Demos#charteditordemo

When chart tools do not work as expected the problem is usally that
the TChartToolset component is not linked to the Tools property of the
chart.

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AL · 2021-04-17 15:48

Do not forget to set the "SHIFT" property for the Tool.   For a
regular mouse click set it to left.

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Muso · 2021-04-17 17:32

Quote from: wp on April 17, 2021, 02:26:32 pmWhen chart tools do not
work as expected the problem is usally that the TChartToolset
component is not linked to the Tools property of the chart.

many thanks! However, this was not the problem, I found now out that
since I also have a ZoomDragTool set to shift state "ssLeft" AND my
legend is inside the axis, the ZoomDragTool got the clicks. So I now
simply changed the order in the TChartToolset and now everything
works.

Besides this, the LegendClick tool is amazing!