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#####################################################
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##
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## FILENAME: cards/display_item.yaml
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## NAME: Display item constructor
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## DESCRIPTION: creates display items like
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## the original firmware
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## PARAMETERS:
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## x: int x of anchor point
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## y: int y of anchor point
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## label: string label, to be shown above the value
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## labelfont: string any of size_1_value, size_2_unit, size_3_label and everything in between
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## labelcolor: string any of white, orange, red, green or grey
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## valuenum: float value to display (numerical)
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## decimals: int rounding of value to display
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## valuestr: string if left empty it will select display the value float
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## valuefont: string any of size_1_value, size_2_unit, size_3_label and everything in between
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## valuecolor: string any of white, orange, red, green or grey
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## unit: string displayed unit
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## unitfont: string any of size_1_value, size_2_unit, size_3_label and everything in between
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## unitcolor: string any of white, orange, red, green or grey
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## align: string TOP_LEFT, TOP_CENTER or TOP_RIGHT
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## USAGE:
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## package:
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## remote_package_files:
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## url: https://github.com/dixi83/ESPHome_ButtonPlus
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## files: [<other files>,'package/cards/display_item.yaml']
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##
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## display:
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## - id: !extend main_display
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## lambda: |-
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## id(display_item).execute(160,2,"External","size_3_label","orange",id(outside_temperature).state,1,"","size_3_value","white","°C","size_3_unit","grey","TOP_LEFT");
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##
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#####################################################
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script:
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- id: display_item
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parameters:
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x: int # x of anchor point
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y: int # y of anchor point
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label: string # label, to be shown above the value
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labelfont: string # any of size_1_value, size_2_unit, size_3_label and everything in between
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labelcolor: string # any of white, orange, red, green or grey
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valuenum: float # value to display (numerical)
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decimals: int # rounding of value to display
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valuestr: string # if left empty it will select display the value float
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valuefont: string # any of size_1_value, size_2_unit, size_3_label and everything in between
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valuecolor: string # any of white, orange, red, green or grey
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unit: string # displayed unit
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unitfont: string # any of size_1_value, size_2_unit, size_3_label and everything in between
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unitcolor: string # any of white, orange, red, green or grey
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align: string # TOP_LEFT, TOP_CENTER or TOP_RIGHT
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then:
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lambda: |-
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// Helper to get the font object from its ID string
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// This lambda function maps font ID strings to their corresponding font objects.
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// If the provided font_id matches a known font, it returns the appropriate font object.
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// Otherwise, it returns nullptr.
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auto get_font = [](const std::string &font_id) -> esphome::font::Font* {
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if (font_id == "size_1_value") return id(size_1_value);
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if (font_id == "size_1_label") return id(size_1_label);
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if (font_id == "size_1_unit") return id(size_1_unit);
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if (font_id == "size_2_value") return id(size_2_value);
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if (font_id == "size_2_label") return id(size_2_label);
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if (font_id == "size_2_unit") return id(size_2_unit);
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if (font_id == "size_3_value") return id(size_3_value);
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if (font_id == "size_3_label") return id(size_3_label);
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if (font_id == "size_3_unit") return id(size_3_unit);
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return nullptr; // Return nullptr if the font ID doesn't match any known font.
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};
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auto get_color = [](const std::string &color_id) -> esphome::Color {
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if (color_id == "white") return id(white);
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if (color_id == "orange") return id(orange);
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if (color_id == "red") return id(red);
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if (color_id == "green") return id(green);
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if (color_id == "grey") return id(grey);
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return esphome::Color::WHITE; // Default color if no match
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};
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esphome::Color labelcolor_script = get_color(labelcolor);
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esphome::Color valuecolor_script = get_color(valuecolor);
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esphome::Color unitcolor_script = get_color(unitcolor);
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// Resolve font objects based on the provided font IDs.
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// These objects will later be used to measure text dimensions and render text on the display.
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auto *labelfont_obj = get_font(labelfont);
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auto *valuefont_obj = get_font(valuefont);
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auto *unitfont_obj = get_font(unitfont);
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// Format the numeric value as a string with the specified number of decimals.
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// snprintf safely formats the float into a fixed-width character buffer.
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char value_str[40];
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// Check if valuestr is not empty
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if (valuestr.empty()) { // Check if valuestr has any content
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snprintf(value_str, sizeof(value_str), "%.*f", decimals, valuenum);
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} else {
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// If valuestr is empty, copy a default or alternative string into value_str
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strncpy(value_str, valuestr.c_str(), sizeof(value_str)); // Example default value
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value_str[sizeof(value_str) - 1] = '\0'; // Ensure null-termination
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}
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// Helper function to calculate text dimensions.
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// This lambda takes a font object and a text string as input,
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// and it calculates the text's width and height (returned via reference parameters).
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auto calculate_text_dimensions = [](esphome::font::Font *font, const char *text, int &width, int &baseline) {
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int x_offset = 0, height = 0;
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font->measure(text, &width, &x_offset, &baseline, &height);
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};
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// Calculate the dimensions of the label text.
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int label_width = 0, label_height = 0;
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calculate_text_dimensions(labelfont_obj, label.c_str(), label_width, label_height);
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// Calculate the dimensions of the value text.
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int value_width = 0, value_height = 0;
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calculate_text_dimensions(valuefont_obj, value_str, value_width, value_height);
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// Calculate the dimensions of the unit text.
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int unit_width = 0, unit_height = 0;
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calculate_text_dimensions(unitfont_obj, unit.c_str(), unit_width, unit_height);
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if (align == "TOP_RIGHT" ){
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// Render the label on the display at the specified position (x, y).
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id(main_display).printf(x, y, labelfont_obj, labelcolor_script, TextAlign::TOP_RIGHT, "%s", label.c_str());
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// Render the value below the label with a vertical offset equal to the label's height.
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id(main_display).printf(x - unit_width, y - 2 + label_height , valuefont_obj, valuecolor_script, TextAlign::TOP_RIGHT, "%s", value_str);
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// Render the unit text to the right of the value text with appropriate offsets.
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id(main_display).printf(x, y - 2 + label_height + value_height - unit_height, unitfont_obj, unitcolor_script, TextAlign::TOP_RIGHT, "%s", unit.c_str());
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} else if (align == "TOP_CENTER" ){
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// Calculate the maximum width of the display item, being the label or value+unit
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// subtract half of that from the anchor point and position based on top left corner of the text fields
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int offset = (std::max(label_width, value_width + unit_width) + 1) / 2;
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// Render the label on the display at the specified position (x, y).
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id(main_display).printf(x - offset, y, labelfont_obj, labelcolor_script, TextAlign::TOP_LEFT, "%s", label.c_str());
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// Render the value below the label with a vertical offset equal to the label's height.
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id(main_display).printf(x - offset, y - 2 + label_height , valuefont_obj, valuecolor_script, TextAlign::TOP_LEFT, "%s", value_str);
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// Render the unit text to the right of the value text with appropriate offsets.
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id(main_display).printf(x - offset + value_width, y -2+ label_height + value_height - unit_height, unitfont_obj, unitcolor_script, TextAlign::TOP_LEFT, "%s", unit.c_str());
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} else {
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// Render the label on the display at the specified position (x, y).
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id(main_display).printf(x, y, labelfont_obj, labelcolor_script, TextAlign::TOP_LEFT, "%s", label.c_str());
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// Render the value below the label with a vertical offset equal to the label's height.
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id(main_display).printf(x, y - 2 + label_height , valuefont_obj, valuecolor_script, TextAlign::TOP_LEFT, "%s", value_str);
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// Render the unit text to the right of the value text with appropriate offsets.
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id(main_display).printf(x + value_width, y - 2 + label_height + value_height - unit_height , unitfont_obj, unitcolor_script, TextAlign::TOP_LEFT, "%s", unit.c_str());
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}
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Martijn
