Text customization to support disable, underline, strikethrough, hili… #5288

ForrestFeng · 2022-05-05T04:01:43Z

Change color within text / colored text

Enhanced the ImGui::TextUnformated() method to make it support arbitrary text color, underline, strikethrough, highlight, mask. This makes the imgui text more expressive.

Please check the demo/result

ocornut · 2022-05-05T07:50:43Z

Hello!
Thanks for the PR. Could you post the demo/result and images here too simply?

ForrestFeng · 2022-05-05T08:44:35Z

Change color within text / colored text

I have enhanced the ImGui::TextUnformated() method to make it support arbitrary text color, underline, strikethrough, highlight, mask

I aslo add one demo for this feature.

The code for the demo is shown below.

The new TextUnformatted signature was changed to support this feature. The wrapped, disabled, and customization are newly added args with default values. So it should be compatible with existing code.

IMGUI_API void TextUnformatted(const char* text, const char* text_end = NULL, bool wrapped = false, bool disabled = false, const ImTextCustomization *customization = NULL);

       IMGUI_DEMO_MARKER("Widgets/Text/Text Customization");
        if (ImGui::TreeNode("Text Customization Simple"))
        {
            ImColor red(255, 0, 0, 255);
            ImColor green(0, 255, 0, 255);
            ImColor blue(0, 0, 255, 255);
            ImColor yellow(255, 255, 0, 255); 
            ImColor brown(187, 126, 0, 255);
            ImColor cyan(0, 255, 255, 255);
            ImColor magenta(255, 0, 255, 125);

            const char* text = "The quick red fox jumps over the green box.";
            ImTextCustomization tc;

            ImGui::NewLine();
            ImGui::Text("Color the whole text");            
            ImGui::TextUnformatted(text, NULL, true, false, &tc.Range(text).TextColor(green));

            ImGui::NewLine();
            ImGui::Text("Color the substring of the text");
            ImGui::TextUnformatted(text, NULL, true, false, &tc.Clear().Range(text + 14, text + 17).TextColor(red).Range(text + 39, text + 42).TextColor(green));

            ImGui::NewLine();
            ImGui::Text("Underline");
            ImGui::TextUnformatted(text, NULL, true, false, &tc.Clear().Range(text).Unerline());

            ImGui::NewLine();
            ImGui::Text("Underline with color");
            ImGui::TextUnformatted(text, NULL, true, false, &tc.Clear().Range(text).Unerline(blue));

            ImGui::NewLine();
            ImGui::Text("Strikethrough");
            ImGui::TextUnformatted(text, NULL, true, false, &tc.Clear().Range(text).Strkethrough());

            ImGui::NewLine();
            ImGui::Text("Strikethrough with color");
            ImGui::TextUnformatted(text, NULL, true, false, &tc.Clear().Range(text).Strkethrough(red));

            ImGui::NewLine();
            ImGui::Text("Hilight the text with brown");
            ImGui::TextUnformatted(text, NULL, true, false, &tc.Clear().Range(text).Highlight(brown));

            ImGui::NewLine();
            ImGui::Text("Mask the text so it is not readable");
            ImGui::TextUnformatted(text, NULL, true, false, &tc.Clear().Range(text+10, text+17).Mask());

            ImGui::NewLine();
            ImGui::Text("Mask the text with color");
            ImGui::TextUnformatted(text, NULL, true, false, &tc.Clear().Range(text+10, text+17).Mask(cyan));

            ImGui::NewLine();
            ImGui::Text("Mask the text with semitransparent color");
            ImGui::TextUnformatted(text, NULL, true, false, &tc.Clear().Range(text+10, text+28).Mask(magenta));
            ImGui::NewLine();

            ImGui::TreePop();
        }

Those text styles are within a text and can be combined as needed.

Here is another demo. It allows the user to adjust the ranges to apply a style and see the result.

The code is on Text Customization Branch

Any comments please let me know.

If it is possible I will create a pull request when ready. Thanks.

ForrestFeng · 2022-05-05T08:45:16Z

Add one more video for this feature.

ImGui.Text.Customization.Video_2022-05-04_132237.mp4

ForrestFeng · 2022-05-05T08:53:01Z

Hello! Thanks for the PR. Could you post the demo/result and images here too simply?

The demo/result and images are copied here. Hope it be useful for others who need this feature.

I may mistakenly close this PR. I do not know how to open it again.

ForrestFeng · 2022-05-05T09:16:11Z

Seems there are some warnings are treated as errors. Should I fix them and update the PR again?

Namek · 2022-09-17T10:41:40Z

imgui.h

+    };
+
+    // Find the style for given position
+    Style GetStyleByPositin(const char* char_pos) const


a typo in "Positin"?

Namek · 2022-09-17T10:42:53Z

imgui_draw.cpp

@@ -3535,11 +3535,12 @@ void ImFont::RenderChar(ImDrawList* draw_list, float size, const ImVec2& pos, Im
    float x = IM_FLOOR(pos.x);
    float y = IM_FLOOR(pos.y);
    draw_list->PrimReserve(6, 4);
-    draw_list->PrimRectUV(ImVec2(x + glyph->X0 * scale, y + glyph->Y0 * scale), ImVec2(x + glyph->X1 * scale, y + glyph->Y1 * scale), ImVec2(glyph->U0, glyph->V0), ImVec2(glyph->U1, glyph->V1), col);
+    draw_list->PrimRectUV(ImVec2(x + glyph->X0 * scale, y + glyph->Y0 * scale), ImVec2(x + glyph->X1 * scale, y + glyph->Y1 * scale),
+        ImVec2(glyph->U0, glyph->V0), ImVec2(glyph->U1, glyph->V1), col);


unnecessary reformat?

Namek · 2022-09-17T10:43:37Z

imgui_draw.cpp

+    ImDrawList _draw_list_text(ImGui::GetDrawListSharedData());
+
+    // Create a dedicated draw list for text. The reson is that the highlight texts must draw before the text.
+    // The highlight texts is genrated during the glyph drawing process.


typo "genrated"

Namek · 2022-09-17T10:44:41Z

imgui_draw.cpp

+    ImDrawList* draw_list_text = nullptr;
+
+
+    ImDrawList _draw_list_text(ImGui::GetDrawListSharedData());


result of ImGui::GetDrawListSharedData() could be put into the if (customization) scope

The ImGui::GetDrawListSharedData() is moved to if (customization) scope. The cost is to new and delete a ImDrawList when drawing the text with customization.

That mentioned cost + the fact it means draw list buffers will realloc+copy every frame and not be amortized is very largely in the range of unacceptably slow in Dear ImGui world. It makes me worry about the veracity of your other statement about performances.

If the alloc/free is expensive we can revert to the old logic. The old logic creates a draw_list_text on the stack this may save some time for us.

For the copy logic adding text draw list to the main draw_lists is shown as below. The text draw list has to be created anyway, so the creation cost is the same. The additional cost is the copy logic.

The VtxBuffer is copied with memcpy should be fast.

The IdxBuffer is copied with a for loop, may cost a few CPU clocks, but it cannot be avoided. If you have good suggestion, please advise.

if (customization) { ... // Append draw_list_text to the main draw_lists { unsigned int old_inx_buffer_sz = draw_list->IdxBuffer.Size; unsigned int old_vtx_buffer_sz = draw_list->VtxBuffer.Size; draw_list->PrimReserve(draw_list_text->IdxBuffer.Size, draw_list_text->VtxBuffer.Size); // draw_list_text->VtxBuffer buffer can be memcopied, it contains no relative data memcpy(draw_list->_VtxWritePtr, draw_list_text->VtxBuffer.Data, draw_list_text->VtxBuffer.Size * sizeof(ImDrawVert)); // draw_list_text->IdxBuffer buffer cann't because the index value in the IdxBuffer points to draw_list_text->VtxBuffer. It need aligned to draw_list->VtxBuffer. for (int i = 0; i < draw_list_text->IdxBuffer.Size; i++) { draw_list->IdxBuffer[old_inx_buffer_sz + i] = (ImDrawIdx)(old_vtx_buffer_sz + draw_list_text->IdxBuffer[i]); } draw_list->_VtxWritePtr += draw_list_text->VtxBuffer.Size; draw_list->_IdxWritePtr += draw_list_text->IdxBuffer.Size; draw_list->_VtxCurrentIdx += vtx_current_idx; } ...

That mentioned cost + the fact it means draw list buffers will realloc+copy every frame and not be amortized is very largely in the range of unacceptably slow in Dear ImGui world. It makes me worry about the veracity of your other statement about performances.

Is there a performance benchmark for text, it would be a good idea to test it and compare the performance results.

Namek · 2022-09-17T10:46:11Z

imgui_widgets.cpp

-    TextEx(text, text_end, ImGuiTextFlags_NoWidthForLargeClippedText);
+    ImGuiContext& g = *GImGui;
+    bool need_backup = (g.CurrentWindow->DC.TextWrapPos < 0.0f);  // Keep existing wrap position if one is already set
+    if (need_backup && warpped)


typo "warpped"?

Namek · 2022-09-17T10:52:39Z

Awesome work! (btw I only skimmed through it, it's not a full review)

Just a question, do you have any idea about the performance impact when the PR's features are not used? Does it change anything?

CodingMadness · 2022-10-27T22:24:54Z

May I ask (cause I am in the process of making use quite bit of the TextColoring mechanisms) if this entire topic is still WIP or safely useable? thanks.

ForrestFeng · 2022-11-23T02:41:37Z

May I ask (cause I am in the process of making use quite bit of the TextColoring mechanisms) if this entire topic is still WIP or safely useable? thanks.

It is still WIP. Not merged to master branch yet.

…ght and mask. # Conflicts: # imgui_draw.cpp

ForrestFeng · 2022-11-23T06:52:33Z

Awesome work! (btw I only skimmed through it, it's not a full review)

Just a question, do you have any idea about the performance impact when the PR's features are not used? Does it change anything?

Thanks for reviewing. For the performance impacts:

There is no performace impact if no customization is applied to the text.
If the text customization is applied, the cost is just some line segments (underlines, strikethroughs) and some filled rectangles(highlight, masks) depends on how many customization applied. The performance should be not a issue in my opinion.

Fuuzetsu · 2022-11-28T02:16:49Z

@ForrestFeng I have a question about this feature: how does it interact with TreeNode? In #728 it shows that it's possible to colour the text by pushing a style: great, but it doesn't work if one wants to have more fancy colouring in the label.

Fuuzetsu · 2022-11-28T02:49:34Z

@ForrestFeng I have a question about this feature: how does it interact with TreeNode? In #728 it shows that it's possible to colour the text by pushing a style: great, but it doesn't work if one wants to have more fancy colouring in the label.

Just to be super clear on what I mean, here's what we can do today just be setting styles and calling Text without spacing in between:

The question is whether this PR will let us do anything about those uncoloured nodes that are currently TreeNode labels.

ForrestFeng · 2022-11-28T05:12:42Z

@ForrestFeng I have a question about this feature: how does it interact with TreeNode? In #728 it shows that it's possible to colour the text by pushing a style: great, but it doesn't work if one wants to have more fancy colouring in the label.

Just to be super clear on what I mean, here's what we can do today just be setting styles and calling Text without spacing in between:

The question is whether this PR will let us do anything about those uncoloured nodes that are currently TreeNode labels.

@Fuuzetsu to avoid misunderstanding can you provide a sample code for what you did on the TreeNode labels? So that I can try to recreate it in my way.

Thanks for your comments.

Fuuzetsu · 2022-11-29T00:47:39Z

@Fuuzetsu to avoid misunderstanding can you provide a sample code for what you did on the TreeNode labels? So that I can try to recreate it in my way.

Actually, I had a look at some of the existing applications linked in imgui README and saw that they are doing exactly what I want.

I'm using rust bindings so I apologise but it seems I can do something like this:

                    let node = TreeNode::new(&ident)
                        .label::<&str, &str>(&lbl)
                        // Don't render arrow unless we're aggregating orders.
                        .leaf(!is_aggregate);

                    let open = node.push(ui);
                    draw_ctx.ui.same_line_with_spacing(0.0, 0.0);
                    draw_ctx.ui.text_colored(
                        imgui_utils::srgb_f32!(#7e77c8).as_imcolor32f(),
                        "XXXXXXXXXXXX",
                    );

to produce "fancy" partially style labels. So feel free to ignore me, I answered my own question and I think the work here doesn't need to worry about TreeNode at all: one would just use your TextUnformatted as normal and it'll just work. Sorry for the noise.

ocornut · 2022-12-13T05:46:29Z

The newly released imgui_test_engine/ repo in the test suite include performance comparaison tools. In Test Engine UI check the “Perfs” tabs. You can compare multiple branches and use the perf tool to visualize the results of all runs. Performance should be compared for both optimized and non-optimized builds.

This fork has been provided as a PR to ImGui: ocornut/imgui#5288

ocornut · 2023-01-10T15:32:49Z

I will be spending a little time evaluating some of the ideas from #5288 (here) and #3130 (and #902), they are similar in essence and both PR are giving a good amount of ideas and starting points.

I think we need to standardize a set of modifiers while being able to:

specify them inline (e.g. within a literal string)
specify them as external modifiers (driven by code and/or data). this has been the approach of both PR but whereas it is a definitive requirement for formatting external data (think InputText() syntax highlight), many typical use cases would likely be best embedded inline in strings.
and as with what I mentioned in Add text alignment support for wrapped paragraphs #4251 (comment) it is essential we tick all the boxes of flexibility, maintainability, ease of use, performances.

Thanks for this!

ocornut added the font/text label May 5, 2022

ForrestFeng closed this May 5, 2022

ocornut reopened this May 5, 2022

Namek reviewed Sep 17, 2022

View reviewed changes

ocornut added the enhancement label Oct 25, 2022

Forrest-Feng added 2 commits November 23, 2022 14:36

Text customization to support disable, underline, strikethrough, hili…

262db5e

…ght and mask. # Conflicts: # imgui_draw.cpp

Fix build warnings and typos.

18e899e

ForrestFeng force-pushed the Text_Customization branch from b844bb0 to c592459 Compare November 23, 2022 06:39

ForrestFeng force-pushed the Text_Customization branch 5 times, most recently from 381d66b to 38e2b0f Compare November 23, 2022 11:15

Code update based on pull request code review.

8ddc119

ForrestFeng force-pushed the Text_Customization branch from 38e2b0f to 8ddc119 Compare November 23, 2022 11:24

PathogenDavid mentioned this pull request Dec 18, 2022

Coloring Part of Window Title #6002

Closed

Quintus added a commit to Quintus/ilmendur that referenced this pull request Dec 28, 2022

Switch to an ImGui fork that supports colours in texts.

5ff1393

This fork has been provided as a PR to ImGui: ocornut/imgui#5288

ocornut force-pushed the master branch from 14d4b36 to c9aef16 Compare January 2, 2023 15:25

ocornut mentioned this pull request Jan 10, 2023

Compact and highlight any displayed text #5791

Open

ocornut mentioned this pull request Jan 24, 2023

Change color within text / colored text #902

Open

ocornut force-pushed the master branch from 4812791 to fac19e1 Compare February 7, 2023 18:29

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		ImDrawList* draw_list_text = nullptr;


		ImDrawList _draw_list_text(ImGui::GetDrawListSharedData());

Text customization to support disable, underline, strikethrough, hili… #5288

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