I need to display additional information with the crosshair. Is there a way to detect when the user switched to crosshair mode and use the mouse position info to draw some text that follows the cursor?
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No direct controls of built-in Terminal GUI
in MQL5 programming environment
Well, MQL4/5 has no direct control over the MetaTrader Terminal 5 built-in GUI elements and their MMI-state ( the cursor state, the less to switch it on/off ). That was never available to the code-execution engine.
How to add it?
If in a need to have such functionality, one may create one's own GUI-layer and simulate a cross-hair functionality ( altogether with any additional add-on-s ) without waiting for GUI interaction with a built-in cross-hair button. This was possible many years back, even in the original MQL4 code.
So the need is definitely doable in MQL5 code.